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Diatomaceous Earth Filter Maintenance

Run filter system 1 hour for every 10 degrees of outside temperature:
Summer 8 to 10 hours per day, winter 4 to 8 hours per day

(If pool looks cloudy, run filter until pool clears- then go back to your regular schedule)

 How to Backwash a Diatomaceous Earth Filter (If your filter requires it, some like Hayward don't)
Most filter manufacturers recommend backwashing after a clean filter has built up 5-10 PSI of pressure as indicated on the pressure gauge. D.E. filters typically build up these pressure levels in approximately 1 to 3 months. Over backwashing can lead to algae problems in the heat of the summer due to the loss of important chemicals. Avoid backwashing within 12 hours after your pool has been chemically serviced.

**Never move the backwash valve when the pump is running (this will break the parts inside the filter)**

1. Shut off the pump
2. Turn the multi port or valve handle to the backwash position
3. If necessary, roll out your backwash hose or open valve on backwash line
4. Turn on the pump and run system for 1-3 minutes or until water in the sight glass or discharge hose turns clear
5. Turn off the pump
6. Place the valve handle in the filter position.
7. Redo the first steps, two to three times, this will loosen up debris and remove more dirt at each backwash cycle
8. Place the multi port valve handle back in the filter position
9. Turn on the pump
10.Wear a dust mask when working with D.E. powder! Coat the filter grids with D.E. powder by adding the recommended amount through the skimmer.


Diatomaceous Earth (D.E.) filters use a powder called diatomaceous earth to strain out the small tiny particles that pass through the system. This product is very inexpensive and readily available at home and garden centers. Each time you backwash a D.E. filter, you will flush out both accumulated dirt and debris and spent D.E. from the filter canister. Failure to replace the canister with fresh D.E. can cause severe damage to the internal elements of the filter and will leave the filter virtually non-effective, since the earth is the primary filtering agent.

There is a simple formula to figure out how much D.E. should be added to your filter. First, determine the size of your filter. The square feet of filtration area inside the filter canister determine filter size. This number is found on a specifications plate on the front of the canister. (Most filters carry a filtration area of 36, 48, 60, or 72 square feet.) Using a one-pound coffee can, add one can of D.E. for every 5 square feet of filtration area. It’s OK to round off to the nearest multiple of 5; the filter won’t mind a little extra D.E. A 48 square foot filter requires 10 cans of D.E. A 36 square foot filter will function effectively on 7 cans of D.E.


Maintenance for a D.E. Filter
Even with regular backwashing, D.E. filters accumulate debris and it is a good idea to have your filter dismantled and cleaned at least once a year. This affords an opportunity to check internal elements for wear and tear, and to ensure that the filter is working at peak efficiency.