Hydor 350 Review: Don’t Buy Before Reading This!

Having reliable water filtration to serve your fish tank will ensure your aquatic buddies consistently access fresh air. If you are looking for a high-quality canister filter for the job, you might want to invest in the Hydor Professional External Canister Filter. Although still new in the market, the Hydor 350 filter has made waves in the fish-keeping community. Water is a source of life and there, when well catered for, it will help to improve the lives of many people all over the world.

Overview Of The Hydor Professional 350

Built with a high-quality, sturdy plastic material, this unit is your best bet towards providing your little guppies with a conducive environment of clean and clear water. It features a convenient design that allows for easy storage around the tank stand. It comes with an impeller securely positioned on a ceramic shaft, which helps prolong the motor’s life.

The filter media has a layout and size that gives you a lot of customization options. The device motor is well insulated and doesn’t produce any noise or disturbance. More so, unlike some of its counterparts, this unit comes with a solid hose in addition to its rotating hose attachment.

Installation is pretty easy, so you might not need to hire a professional. The filter packaging includes a detailed instruction manual that is very easy to follow. However, you might still want to get help if you don’t feel confident enough. The efficiency of this unit is optimal, which is why there’s so much hype about it.

This review will look at the facts and figures that make the Hydor 350 one of the best canister filters in the market for the money.

Hydor Professional External Canister Filter – Aquarium External Filter – Telescopic Intake Tubes, Easy Priming – EcoSystem in a Box – Biological, Mechanical, Chemical Filtration – 190 to 345...
  • COMPLETE ECOSYSTEM IN A BOX: This external filter for generation aquariums offers maximum performance and high filtration standards, not to mention an entire eco-system in a box
  • PREMIUM VERSATILITY: This professional external canister filter for aquariums features a priming pump that offers the versatility you need. The unit is ideal for both freshwater and saltwater aquariums


  • Setup is super easy
  • Equipped with a safety lock system
  • Incredible flow rate
  • Priming is easy
  • Reasonable price
  • Easy usage and maintenance


  • Replacement parts may be scarce

Features and Benefits

So much has been said about the Hydor filter, making it very easy for many people to believe it’s hype. To clear the air, let’s take a close look at the features and functionality of the filter. Here is our Hydro 350 review of all the features you can expect with this exceptional filter and the benefits you will enjoy. 

Sturdy Construction

When handling this filter for the first time, the first thing you will notice is its sturdy build, which can be attributed to the choice of high-quality plastic used for its construction. This makes it “tough” and able to meet all your filtration needs. Even when used in the most demanding situation, it will still perform without breaking down.

The sturdy construction also helps to ensure its durability. This is not like one of those filters that will break down after few months of use. A four-locking clamp system is added to the unit to provide support and ensure the optimal performance of the device motor. All the filter parts are tightly sealed to prevent possible water leaks.

Easy Setup

Many canister filters out there do not come with clear instructions on how to install them. As a result, only users with previous experience can get around them. Luckily, Hydor models are not that way.

The Hydor 350, in particular, is one of the most accessible filters in the market anyone can assemble and install, even if you’ve never installed a canister filter in the past. It comes with simple and clear instructions to help you put the unit together in less than one hour, no matter your skill level.

It is also important to note that this machine is straightforward to clean. It’s not like one of those filters that produce many messes inside when opened for maintenance. So you don’t have to worry about getting goosebumps.

The filter is straightforward to dismount and open. Don’t forget to lock the central supply hose before you start. This will significantly help to reduce the amount of water dripping from the device.

Also, ensure you remove the impeller on the ceramic shaft for thorough cleaning. Doing this will increase the life of the motor.

Great Flow Rate And Filter Capacity

When choosing an aquarium filter, flow rate and filter capacity are two areas you mustn’t joke with. You want to go for a filtration system that promises an impressive flow rate at all times. The filter capacity should also be able to serve your tank size. Luckily the Hydor 350 does not disappoint in this area.

Hydor has a flow rate that ranges between 240-280 gallons of water per hour. This is something to laud about, as seen in the number of satisfied users who can’t help but express their delight. In terms of the tank size it can take on, anything between 20 to 150 gallons is a good match.

With this particular filter, you get up to 3 media trays which can be arranged to your desired preference. Three media trays might not sound like too much, but it gets the job done. All filter media required to meet the filtration needs of the aquarium are provided except for carbon. But you can purchase this easily.

Silent Operation

As a new brand in the market, many wouldn’t expect Hydor to have mastered the art of making low noise filtration systems. But this is not the case. Their filters, including the Hydor 350, are some of the most silent canister filters out there. Even if you have to use it often, it will deliver a consistent quiet operation.

The quiet operation can be attributed to the insulated motor of the filter. No more humming sound, as in the case with many conventional filters. You may need to feel the machine with your hand to know if it’s running.

Things to Consider Before Buying a Water Filter

Water is essential for life. But the quality of water we consume every day is becoming dangerous for our health. To improve water quality, use in our daily activities, installing water filters in our home is essential. Usually make mistakes when buying water filters in various aspects, including capacity and flow rate.

Several water filters are available in the market, but not all will work best for you. Every water filter is unique in its way. But it is necessary for a water filter that you have chosen to work best for your requirements. Before buying a water filter, you should conduct a thorough analysis to get the best solution for your water filtration needs. Here are some of the things to consider before you buy a water filter.

The level of purification for different water usage requires an extra level of purification. Also, every water filter has its group of cleansing. For example, drinking water requires a different level of purification from water for washing clothes. Drinking water is necessary to be purer than any other water. In general, water that is consumed in the body requires a high level of purity. That is because contaminants are more dangerous when ingested into the body than when they contact the body.

The level of purity you want for your water and the purpose to which the water will be used should guide you to choosing the right water filter that will satisfy your needs. Before buying a new water filter, ensure you read all the instructions indicated and the types of contaminants in the can filter. Failing to consider that will lead you to the wrong water filter.

Test the Water Quality of Your Supply

The quality of water you use in your home depends on the source where the water is coming from. Most filtration requirements are defined by the source of water you use. The very first thing to do is to test the quality of water that is supplied to you. There are several kits available for testing the quality of your water. You can also decide to call an expert in the field to come and do the task for you. You only need to install a water filter if your water is contaminated because the main aim is to remove the impurities. If you find your water has no impurities, a situation that is hard to find, then there is no need to install a water filter.

Different water filters have additional capacity to remove impurities. Some may not remove certain in purities. That is why it is essential to test the water quality first.

There are mainly two types of water sources:


Private sources of water include bottled water and water from ponds, streams, and rivers. They include water coming from sources that are manmade.


Public sources of water are the ones provided by public entities such as local government. Water from private sources such as wells and bottled water can be well filtered by eliminating the contamination from the source. But rivers and streams will require a lot of expense and time to be cleaned. Natural private sources are not reliable in quality; therefore, a water filter is necessary to filter the water and make it safe for use.

You can file a complaint against the water contamination and quality in the public water source, which may not be readily effective. If water from a public authority is contaminated, the only solution is to install a water filter in your home. That will ensure the water you use for purposes such as drinking is safe for your health.

Check your home water system.

There are incidences where water reports and tests do not show any hazardous contamination in your water while in real sense it is contaminated. It is very difficult to find water without impurities unless it has been filtered. In that case, the problem may have arisen from your home water system. There may be leakages in the pipes going around your house.

You need always to ensure that the surroundings of your house are clean and that there is no clogged drainage around your supply. Metal water pipes slowly accumulate rust, and with time, this rust will cause blockages in your pipe. There may be other organic contaminants due to moisture. The pipe throughout the house should be clean to prevent organic growth and rust.

Flow Rate

You are exceeding the water flow capacity of a cleaner not to purify the water as required. Every water purifier usually has an optimum water flow capacity. Bacteria and other contaminants can therefore pass through the filters. It would help if you took note of the per-minute volume that your water purifier can handle. That way, you will know the type of water purifier that is best for your home.

Any water purifier that is worth your money should be lightweight and be movable. 

Storage Capacity

The storage capacity of a cleaner you have chosen for your home will depend on the number of people using it. You can decide to invest in a small-size cleaner only if you and your family are the only people who will be using it. The situation changes if you intend to use the purifier in-office setting. Go for a water filter with a big storage capacity. That will give you an easy time because you will not have to refill it from time to time.

Understand your needs

Water filters eliminate only the specific contaminants that they mention in their labels. Not all water filters will eliminate all the pollutants. You, therefore, need to be aware of the pollutants that are in your water. That will enable you to choose an appropriate filter that will meet your filtration demands.

Once you are in the market, check the contaminants that the water filter you want to buy eliminates. Analyze your daily consumption of water based on purposes like drinking, washing, and cooking. If you need water purification for all your needs, the best filter choice is whole house filters with a point of entry system. If water purification is required only for drinking and bathing, filters like under sink filters are the most preferred.

Maintenance cost

The maintenance cost of all filter categories varies highly. While many filters may come cheap, maintenance like the replacement of cartridges and hoses is costly. Before buying a filter, get the company’s detailed maintenance and repair costs of your water filter.

Water filters are not a one-time investment. They need regular maintenance depending on the quality of the cartridges. Many companies provide features like quality index and security alarms for beneficial cartridge replacement. If the filters are regularly maintained, the quality of water deteriorates.

Buy only certified water filters.

The reviews not only help in finding a water filter company that is legitimate, but they also help you find the right one for your requirements. Customer feedback is the best way to find a water filter company for product duality and performance and the post-sales services and warranty.

You can also compare the price of the water filters online. If the price of another product with the same feature is low, it will benefit your pocket.

Beware of Scams

There are many water filters available in the market to the extent that knowing an original and a fake one is difficult. It would help if you were careful to ensure you don’t get scammed because there are many fraudsters.

In the case of any health-related product, you should be aware of the scams that go around to stay alert and prevent getting scammed. It highly depends on the company you buy the water filter from. Many companies provide water filters at meager costs. They are mostly fake. Water filtration is not a cheap process, and any person who sells them at an unbelievably low price is probably a scam.

Water Pressure

Both UV and RO filters need a water supply at a good pressure. If the incoming water flow does not have sufficient force, the RO filter will not work optimally. So, if the power of water supplied to your home is insufficient, it is essential to consider buying a filter that will enhance pressure.

Cost of water purify

Knowledge helps you make the right decision. Before you make your purchase, find out the price of your preferred brands of water purifiers, along with some information about the filters. You should also know the number of times the filter will have to be changed and the cost involved. Gather information about the annual service and maintenance plans of various water purifier brands.

After-sales service

Before you bring home your new water purifier, find out about the purifier company’s annual service plan and charges. Check if the company’s service center is located near your locality. 

Determine Level of TDS

Begin by getting information about the total dissolved solids content in your water supply. It is essential to know if you are supplied with hard water that contains a higher percentage of minerals and salt deposits. If this is the case, you will have to choose a water purifier that effectively treats hard water. Drinking water should not have TDS levels exceeding 500 ppm. If the TDS level in your water supply is higher, you should choose a water purifier enabled with RO and UV technology.

Frequently Asked Questions

Does it come with a wall plug?


Can the filter be adjusted?

Yes, it can be adjusted.

What’s the tube diameter?

The inlet side is ¾,” and the outlet is 5/8″

Is the black coarse sponge charcoal activated?

No, it lacks charcoal activation.

What is hard water?

Hard water is water that contains dissolved calcium and magnesium. It is adsorbed as water travels in streams and through the ground on its way to its source. Calcium is mainly responsible for all challenging water problems that need to be treated. It is classified as temporary hardness. Magnesium causes permanent hardness in water that rarely causes problems.

Water hardness is responsible for some types of water spots, scale build-up, and play havoc with soaps and detergents. Extreme hard water can make water undesirable to drink and can be harmful to humans and animals.

Hard water can be treated with water softeners and water conditioners, depending on the desired results.

Does it come with hoses?

Yes, it does.

What is soft water?

Soft water is water that has never been exposed to calcium or magnesium, or the elements have been removed through a process that replaces calcium or magnesium with sodium chloride. The term softened water reflects the hardness minerals that have been exchanged through a mechanical process called a water softener.

 How does a water softener work?

A water softener removes calcium and magnesium hardness and replaces it with sodium or potassium chloride through an ionic exchange. Inside the water, the softener is a synthetic mineral which is a petroleum by-product called resin. As water flows over the resin, it attracts hardness minerals to it, similar to a magnet.

The resin beads give off sodium in exchange which is absorbed into the water. The resin beads only retain a specific amount of sodium and can only exchange a certain amount of hardness called softening capacity. Once the softening capacity has been exhausted, saltwater is needed to reverse the exchange process.

Although a water softener looks complex, the actual process of regeneration is simple. It consists of drawing saltwater from a salt tank, introducing the saltwater to the bare mineral, rinsing the retained hardness down the drain, and rinsing the excess sodium down the drain as well. Once that has occurred, the softener begins the softening process and you will get clean water.

The Bottom Line

Overall, this unit boasts a premium performance that ensures your aquarium is filled with clean and crystal clear water. It has a high capacity that is not common with many products in its category. It is, therefore, a great choice to consider. If you want a filter unit you can rely upon to deliver efficient performance for your aquarium, then the Hydor 350 is the way to go.

Hopefully, the information provided in this article is sufficient for you to make an informed decision about this particular filter. We highly recommend it, but now you can decide for yourself whether it is worth the price.


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