How To Clean A Pool Filter: The Ultimate Experts Guide!

How To Clean A Pool Filter
Written By: Chris Tebbutt
Date Published: August 3, 2022

A pool pump and filter system play an essential role in any swimming pool, but maintaining and cleaning everything can be a hassle and sometimes even a daunting task.

With so many different types of filters, cartridges, and equipment it can be easy to get lost in everything.

However, fear not! From best practices and techniques, we'll show you how to clean a pool filter easily and effortlessly starting today.

The Different Types Of Pool Filters

Before you get started, you actually need to know what type of filter you are dealing with, so here is a quick breakdown of the different types.

Sand filters

How To Clean A Pool Filter: The Ultimate Experts Guide! 1

Sand filters are becoming popular as a great mid-range filter option. They are shaped like a sphere or a large cylinder and usually sit beside a pool. As the name suggests, sand filters use sand to clean contaminants. These filters are ideal for most above-ground swimming pools, but they can also be used with pop-up swimming pools.

Cartridge filters

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A cartridge pool filter is made of pleated paper or fabric that traps particles as the water flows through it. Cartridge pool filters are typically more effective than sand filters at removing smaller particles, making them a good choice for kiddie pools.

They are also easier to clean than sand filters, as the cartridges can be removed and washed with a hose. The ease of use, setup, and price make such filters very budget-friendly.

Diatomaceous earth filters (DE Filters)

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Diatomaceous earth is a naturally occurring substance that is made up of the skeletons of tiny aquatic creatures called diatoms. These skeletons are incredibly porous, and when they are ground into a powder, they can be used to filter out impurities from water.

Diatomaceous earth filters are commonly used in swimming pools and hot tubs, but they can also be used to filter drinking water. When water passes through a diatomaceous earth filter, the impurities are trapped in the pores of the diatomaceous earth, while the clean water passes through.

While such filters work great, it's not the most budget-friendly, so you will have to invest some money initially to get a good setup.

Easiest Method to Clean a Cartridge Filter

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While you can clean your filters yourself, it can take a few hours up to a day to clean your pool filter cartridge. If you prefer to not go through the hassle, then consider Neoterics Blaster 3000 cartridge cleaner.

https://www.youtube.com/watch?v=zVQkZyVzGRI

Even the older model performs really well when cleaning a pool filter cartridge, and this video demonstrates just how easy and effortless it is.

Advantages of using Neoterics Blaster 3000

  • Quick and seamless
  • Very budget-friendly
  • Saves a lot of time
  • Easy and simple to use

If you however prefer to clean your pool filter cartridges by hand the old-fashioned way, then here's how.

DIY way to clean a pool filter cartridge

pool filter cleaner homemade
  • Turn off the pump and use the air relief valve to remove air from the system.
  • Remove the clamps and the pool filter cartridge, and inspect for any damage.
  • Use a cleaning spray and garden hose to wash between the pleats.
  • If you want a deeper clean, you can soak the cartridge with filter cleaner or soap overnight in a bucket.
  • Then rinse the filter cartridge, put it back inside the filter, close the clamp securely, then turn the pump on and release air via the valve. That's all there is to it!

Ideally, I recommend that you have a few pool filter cartridges that you can use on a rotation basis because getting a thorough clean can take time in some cases.

Whenever you need to clean your pool filter cartridge, you still want your pool to operate smoothly and efficiently without any contaminants.

When you are cleaning your pool filters, filter cartridges, or the filter tank don’t use dishwasher detergent, muriatic acid solution, deep cleaning pressure washer, or acid bath, and always double check the appropriate amount of acid solution you used. The recommended amount is a water mix of one part muriatic acid and 2 parts water volume. Make sure to assemble the diluted solution in a large bucket and completely cover the lid and let it soak overnight. Filter cleaning should be done after you read the owner’s manual and clear out the other filter cartridge elements and filter housing. You should remove debris and small particles in a large bucket or trash can. Water sprays through the regular garden hose or the spray nozzle should clean algae and make it ready for the large trash can. Alternatively, you can use a multiport valve to deep clean the plastic trash and body oils.

A pressure gauge can be used to clean all the grids and all the debris, however, the spray nozzle or a steady stream is enough for filter cleaning. After you are done with the garden hose, release the air relief valve and use the cleaning solution to carefully brush every square inch of the dirty filter, filter housing, and pool pump. The cleaning solution should be designed for deep cleaning as stated in the filter owner's manual. After all water chemistry is sensitive to pressure increases and excess air. Release the air relief valve and use normal range pool water to rinse everything, including filter housing and outlet valves.

How To Clean a Sand & D.E. Filter Step By Step

Sand filters and D.E. filters are cleaned more or less the same way with a few exceptions. For a better understanding of the cleaning process, check out the video by Swim University along with the steps down below. You'll get a clearer understanding of the whole process.

Step 1: Switch off the pump

First and foremost you will need to switch off the pump and check the pressure gauge. After it is turned off, attach a backwash hose to your filter.

Step 2: Turn the filter system to "backwash"

Turn the port valve to backwash position and turn the filter back on. You will see some gunk get flushed out. Let it run for a few minutes until the water becomes clean.

For D.E filters, let it run for about five minutes. After you are done backwashing, make sure to also open the air relief valve, and remove the drain plug, the filter clamps, manifold, and the grids/fingers.

Step 3: Set the filter to "rinse"

After running the backwash for a minute or two, turn off the pump, and set the valve to rinse. You can turn it back on, and let the filter rinse for about a minute.

For D.E filters, rinse the filter tank and clean the manifold and grids/fingers which you just removed. After you are done, put everything back where they belong.

Step 4: Set the valve back to "filter"

After letting the filter rinse itself for about a minute, turn off the filter, and set the valve back to "filter" position. That's it! You are done cleaning your sand filter.

For D.E filters, add some D.E powder, then safely put everything back in place and secure everything. You are done!

Please read the owner's manual as well as some filters might have little differences here and there.

Supply:

  • Large tub (for cartridge filters)
  • Plastic cup (for sand filters)
  • Plastic tub (for earth filters)
  • Extra cartridge (for cartridge and DE filters)
  • Extra sand (for sand filters)

Tools:

  • Gloves
  • Screwdrivers
  • Wrench
  • Backwash Hose

Frequently Asked Questions

Here are the answers to the most commonly asked questions regarding when to clean and replace a pool filter.

How often should you clean a cartridge filter?

Depending on how dirty your pool filter is, it might depend, but generally cleaning it with a garden hose every 1-2 weeks is recommended, and a deep thorough clean every 1-2 months.

If you live in a clean neighborhood without much dust, leaves, or debris, then you may need to clean your pool filter cartridge every once in a while. A good gauge is to look at the pool cartridge and do an eye test. If it looks a little brown, it's definitely time to clean it.

When should you replace a cartridge filter?

If you take good care of a pool cartridge filter, it can last up to 3 years or even more. If however, you don't clean it often, then you are reducing its lifespan to 1-2 years.

Whenever you do wash the filter cartridge, make sure to be gentle so as to not damage the pleats.

How often should you clean a sand filter?

How often you need to clean your sand filter will depend on a number of factors, including the size of your pool, the type of pool, and how often it is used.

In general, it is best to clean your sand filter every 3-4 weeks by backwashing it. However, if your pool is small and not used very often, you may be able to go longer between cleanings. Conversely, if your pool is large or gets a lot of use, you may need to clean your filter more frequently.

No matter how often you clean your filter, it is important to inspect it regularly and backwash it when necessary to prevent it from becoming overloaded. Usually, when the PSI of the filter tank is above 10-15, it means your system needs a clean.

When should you replace the sand in a sand filter?

The frequency of replacement will depend on a number of factors, including the size of the pool, the type of pool, and the amount of use.

In general, most experts recommend replacing the sand every three to five years. By following these guidelines, you can keep your pool clean and clear for years to come.

How often should you clean a D.E. filter?

Depending on the size of the pool or hot tub, the filter should be backwashed every two to four weeks. Make sure to add some D.E powder whenever you clean the filter.

However, if you don't use the filter that much, maybe every month or so.

If you need a thorough clean, you can use muriatic acid, but make sure to wear something to protect your eyes and acid-resistant gloves.

The D.E grid or fingers should be cleaned two to four times per year.

With proper care, diatomaceous earth filters can provide many years of trouble-free operation.

When should you replace a D.E filter grid?

With proper care pool owners can expect a D.E. grid to last for several years around 7 up to 10 years; however, if it becomes damaged or worn out, it will need to be replaced in order to maintain optimum filtration efficiency.

Final Thoughts

Yes, owning a pool can be a hassle. From pool water maintenance, getting the pool chemicals right, to washing and cleaning your pool filter it does require care and time.

If you own a Cartridge Filter system, then I suggest you just get one of the automatic cleaners like the Neoterics Blaster 3000 to save some time and energy on cleaning pool cartridges.

We earn a commission if you make a purchase, at no additional cost to you.

For sand or D.E filter owners, you could hire a specialist to do the cleaning for you if you have the money, however, if you prefer to clean your pool filter yourself, as long as you read and follow the instructions above you shouldn't have any problems.

Make sure to read the owner's manual, but after a few repetitions, you will get the hang of it.

Article written by Chris Tebbutt
In 2016 I got my first house that had a pool and I had no idea where to begin. Over time I have learnt how to do most things myself (I am really into DIY) and wanted to share my information with other. I was one of the people who thought if water smelt like chlorine, that meant there was too much chlorine in the water!
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