Filtration & Circulation /
How to Clean a Hayward Pool Filter Safely
To clean a Hayward pool filter, shut off the pump first, then service the filter by type—cartridge, sand, or DE—using your manual and pressure gauge.
Archive date: this article was written for PoolSkimmer on Oct 23, 2026 and given the earlier archive date of Apr 1, 2026 so the blog reads as an organized archive. It was not published on that date.
The proper way to clean a Hayward pool filter
The safest course of action is to shut the pump off before handling the filter in any way. From there, follow the instructions in the Hayward manual for your particular filter type. Cartridge filters call for the element to be taken out and given a good rinse or a thorough cleaning. With sand or DE units, one should stick to the backwashing and service procedures as approved by the manual. Hayward recommends regular checks and upkeep in line with their product guidelines.
Identifying your Hayward filter
You will want to know if you are dealing with a cartridge, sand or DE model, as that dictates the cleaning process. When in doubt, have a look at the model label and the manual prior to opening the tank.
- A cartridge filter has an element that comes out for cleaning.
- Sand filters are typically cleaned via backwashing.
- DE filters may require backwashing and some work on the grids or other internals.
There is no room for guessing here; an incorrect procedure can do damage to the filter and compromise its ability to filter.
Service for a Hayward cartridge filter
These are generally the most straightforward to put right, but they do require some care.
1. Let the pressure subside after turning the pump off. 2. Open the unit in the manner set out by the manual. 3. Take the cartridge out with care. 4. A garden hose will do to wash away the debris. 5. Where the manual permits, a filter cleaner can be used for something more than a surface rinse. 6. Give the O-ring, tank seals and the cartridge itself a once-over for any signs of wear. 7. Put everything back together securely and get the system running again.
Should the cartridge prove to be clogged, flattened or cracked even after this effort, it is time for a new one instead of further washing.
Dealing with sand and DE filters
When the pressure gauge shows a rise, it is a sure sign the filter is full of debris and needs attention. Backwashing is the usual remedy for these models. Make sure to use the multiport or valve sequence exactly as the manual prescribes; do not try to force the handle or run the pump on an improper setting.
DE filters in particular demand close adherence to the manual since the internal parts and grids need looking after. If the task of opening the tank or working on the grid assembly does not sit well with you, it is best to leave it to a pro.
Indications that the filter wants servicing
Some things to watch for include:
- Pressure reading higher than it should be
- Poor circulation or feeble return jets
- Dirt making its way back into the pool
- Any leaks at the lid, clamp, drain plug or tank
- A cartridge that is torn, scaled or otherwise distorted
If the filter is soiled again in short order, it could be something beyond the usual maintenance. Worn media, an overabundance of debris or water chemistry issues can all be culprits.
Things to steer clear of
Do not open the filter with the pump in operation, nor reach into any suction equipment that is running. Avoid unlabelled chemical mixes or other shortcuts and make use of the appropriate PPE when dealing with dirty components or chemicals. Fittings and clamps should never be forced; a seal or O-ring that is not properly seated will only lead to leaks and pressure headaches.
Time to call in a professional?
If you cannot put a name to the model, or if the pressure remains off after you have done your work, get some qualified assistance. The same goes for any electrical fault at the pad or if the filter requires more in-depth service than what is covered in the book. In the event of an electrical problem, put the pool out of commission until it has been seen to. Safety is paramount and the manufacturer’s manual is there to be followed.
Sources and further reading
- [Hayward: Weekly pool maintenance](https://www.hayward.com/maintenance/weekly-pool-maintenance)