A clean pool filter is essential for maintaining clear, healthy water and ensuring your commercial pool equipment runs efficiently. There are three main types of pool filters:
- Sand filter
- Cartridge filter
- Diatomaceous Earth (DE) filter
Each requires a different cleaning method. In this guide, we’ll walk you through the proper cleaning techniques for each type so you can keep your commercial pool in top condition. Please note that if you are inexperienced with handling pool equipment, we highly recommend contacting a professional pool company to assist you in any repairs, cleaning, renovations, or maintenance the facility may need.
Table of Content
How to Clean a Sand Pool Filter
Sand filters are one of the most common types of pool filters due to their durability and ease of use. Over time, debris and contaminants build up and need to be flushed out. The cleaning method for sand filters is called backwashing, which is a built-in functionality in most sand filtration systems. Backwash and clean your sand filter when the pressure gauge reads 8–10 psi higher than the normal operating pressure or at least once per season. It’s important to note that every system is different, however these are the general steps to backwash and clean a sand filter:
- Turn Off the Pump – Always start by switching off your pool pump to prevent damage.
- Ensure Backwash Pipe Drains Correctly – Make sure the backwash line can handle the volume of water it will deliver to the sewer line. Too much backwash water going into the sewer drain may cause backup in your pool house. In some cases, a temporary drainage hose may be needed. Connect a hose to the waste port if your system requires one.
- Set to Backwash Mode – Turn the multiport valve to the “Backwash” setting.
- Turn the Pump On – Let the pump run for about 2–3 minutes or until the water in the sight glass runs clear.
- Turn Off the Pump Again – Never move the multiport valve while the pump is running.
- Set to Rinse Mode – Change the multiport valve to “Rinse” and turn the pump on for about 30 seconds to settle the sand and clear the pipes.
- Turn the Pump Off and Reset to Filter Mode – Once rinsing is complete, switch back to the “Filter” setting.
- Check and Adjust Water Levels – Backwashing removes water, so top off your pool if necessary.
- Restart the Pump – Your sand filter is now clean and ready to operate.
How to Clean a Cartridge Pool Filter
Cartridge filters are popular for their efficiency and are considered disposable media, typically needing full replacement every couple of years. Unlike sand filters, they require manual cleaning rather than backwashing. Rinse and clean your cartridge filter when the pressure increases by 8–10 psi or every 4–6 weeks during peak season, depending on usage. This method can be more time-consuming but if done consistently it will prolong the life of your cartridge filters.
- Turn Off the Pool Pump – Safety first—always power down your system before cleaning your filters.
- Release Air Pressure – Open the air relief valve on the filter tank to release pressure.
- Remove the Filter Cartridge – Open the filter housing and carefully take out the cartridge.
- Rinse with a Hose – Use a garden hose to spray down the filter pleats, working from top to bottom.
- Soak in a Cleaning Solution (if needed) – For deep cleaning, soak the cartridge in a filter cleaning and degreasing solution for several hours.
- Rinse Again and Inspect – Check for damage or excessive wear. Replace cartridges if torn or the pleats stick together, which would reduce filter surface area.
- Reinstall the Cartridge – Place the cartridges back into the housing and secure the lid or filter body. To prevent downtime, it is advisable to have an extra set of cartridges that can be swapped at each filter cleaning.
- Restart the System – Turn the pump back on and ensure everything is running smoothly.
How to Clean a DE Pool Filter
Diatomaceous earth (DE) filters provide superior filtration but are not nearly as popular as their sand or cartridge counterparts. A DE filter uses sediment to clean your pool water. While it catches much finer particles compared to other filer types, its cleaning process is more involved. Backwash your DE filter when the pressure rises 8–10 psi above normal and do a full teardown and deep clean at least once per season. The backwashing procedure is similar to that of a sand filter. To do a deep clean:
- Turn Off the Pool Pump – Always start by cutting power to the system.
- Backwash the Filter – Set the valve to “Backwash” and run the pump for a few minutes until the water clears.
- Turn Off the Pump and Open the Drain Plug – Allow remaining water to drain from the filter.
- Disassemble the Filter – Remove the filter grids from inside the tank.
- Rinse Each Component – Use a garden hose to clean off all DE residue.
- Soak in a Filter Cleaner (if needed) – If the filter is particularly dirty, soak the grids in a cleaning solution.
- Reassemble the Filter – Put everything back together and ensure a secure fit.
- Recharge with Fresh DE Powder – Follow manufacturer recommendations for the correct DE amount, adding it through the pool skimmer while the pump is running.
- Restart the System – Turn the pump on and check for leaks or irregularities.
Final Thoughts
Regularly cleaning your pool filter extends its lifespan, improves water quality, and ensures efficient operation. Whether you have a sand, cartridge, or DE filter, following the right maintenance steps will keep your pool running smoothly.
If you operate a commercial pool in the Atlanta metro area and need professional maintenance, Sears Pool is here to help. Contact us today to learn more about our services and how we can keep your pool in top shape!
