11
Cleaning your Filter using a System with a Separation Tank, cont’d.
b. Multiport Rotary Valve.
After completing Steps 1 to 3 of this section; on page 10, perform the following steps:
(1)Position the valve to the BACKWASH setting.
(2)Open the High Flow™ manual air relief valve until it snaps into the full open position (this only requires a quarter turn
(3)Stand clear of the filter tank, then start the pump.
(4)Close the High Flow™ manual air relief valve after a steady stream of water appears and run in the BACKWASH mode for 1 minute.
(5)Stop the pump, set the filter valve to FILTER and run for 20 seconds, then stop the pump.
(6)Repeat the BACKWASH/FILTER cycle 3 times.
(7)When the sight glass shows a clear flow of water, shut off the pump.
(8)Position Multiport Rotary valve to the CLOSED setting.
(9)Follow section 4.a – Slide Valve on page 10.
Cleaning Filter Elements
For a more thorough cleaning of the individual elements, perform the following steps:
1.Cleaning with water:
a. Using a garden hose, thoroughly flush off all contaminated diatomite from the filter element surfaces.
2.Cleaning with muriatic acid:
WARNING — Working with muriatic acid can be dangerous. When cleaning elements always wear rubber gloves 
and eye protection. Add acid to water, do not add water to acid. Splashing or spilling acid can cause severe personal injury and/or property damage.
a.A stiffening of the fabric caused by mineral deposits is usually referred to as "liming up". It usually is due to deposits of either magnesium or calcium or both. Removal of these deposits may be accomplished by soaking the filter elements in six (6) parts water to one (1) part hydrochloric acid (muriatic acid).
b.Wear rubber gloves and eye protection when mixing the solution, and handling or rinsing the filter elements.
c.Soak for at least four (4) hours in a plastic tub or pail.
d.Rinse filter elements thoroughly in tap water.
Quad D.E.® Filter Installation and User’s Guide