7
FNS
®
PLUS Vertical Grid D.E. Filter Installation and User’s Guide
Cleaning the Filter Using a System with a Separation Tank (cont.)
(9) Remove bag and dispose of diatomite in trash can. Replace clean bag and set bag in seat (curved portion
of Separation Tank). Put plastic hold-down in place to prevent earth from going back into pool, one double
bag is furnished with Separation Tank.
Note: Filter waste and diatomite are trapped by the heavy-duty double lined Separation Tank bag. Contents
are to be placed in a waste or trash container, clean the bag and re-insert in the Separation Tank. DO NOT
LEAVE THE SEPARATION TANK BAG EXPOSED IN THE SUN. The manufacturer cannot assume any
responsibility for torn, or damaged bags, if left in the sun to dry.
(10) Replace Separation Tank lid and secure Separation Tank lid clamp. Follow instructions on page 3, Filter
Clamp Installation.
(11) Leave valve in normal FILTER position.
(12) Follow instructions on page 5 to start up filter.
(13) Introduce the recommended amount of diatomite per Table 2, on page 4. Your filter is now in operation.
b. Multiport Rotary Valve.
After completing steps 1 to 3 of the Push-Pull Valve section on the previous page, perform the following steps:
(1) Position valve to 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 counter-clockwise). Opening this valve rapidly releases air trapped in the filter.
(3) Stand clear of the filter tank, then start the pump.
(4) Close the manual air relief valve after a steady stream of water appears.
(5) When sight glass shows a clear flow of water, shut off pump.
(6) Position Multiport Rotary valve to CLOSED setting.
(7) Follow steps 7-13 in the Push-Pull Valve section, above.
Cleaning the Filter Elements
To completely disassemble the filter element assembly for a more thorough cleaning of the individual elements, stand
the element assembly on the deck exactly as it comes out of the filter with the manifold on top.
1. Disassembly:
a. Remove plastic stand-offs from tie rod ends (on some models).
b. Using a 1/2 in. wrench or deep socket, remove both nuts from the manifold.
c. Remove top manifold by holding lift handles and pulling straight up.
d. Gently remove the plastic template from the elements.
e. Remove elements one at a time from the bottom spreader.
2. Cleaning with water:
a. Using a garden hose, thoroughly flush off all contaminated diatomite from the filter element surfaces.
3. Cleaning with muriatic acid:
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.
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.
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