4
FNS
®
PLUS Vertical Grid D.E. Filter Installation and User’s Guide
SYSTEM START UP AND OPERATION
Coating Filter Elements with D.E.
1. Push-Pull Valve
a. Push handle on valve down with slight twisting motion as far as it will go. Lock upper pin in cap. Open High
Flow™ Manual Air Relief Valve on the filter. Proceed with steps 2.b to 2.g, below.
2. Multiport Rotary Valve
a. Position valve to FILTER OR VACUUM TO POOL setting. This is your normal flow from the pump through the
filter to the pool. Open the manual air relief valve on the filter. Proceed with steps 2.b to 2.g, below.
b. Prepare recommended amount of diatomaceous earth by mixing it with water in a bucket until it is the
consistency of milk; see Preparing Diatomite above.
c. On initial start-up the pump must be primed by filling the hair and lint strainer pot with water. You may have to
do this several times.
d. Follow the steps outlined in on page 5 for system start-up.
e. Introduce the slurry of diatomite from the bucket directly into the top of the skimmer. With the pump running
and the pool skimmer valve open, pour the mixture directly into the skimmer. The slurry will be drawn into the
filter.
f. Your filter is now operational. Note the original starting pressure on the gauge and record it below.
g. Clean your filter when pressure reads between 10 to 12 psi higher than the original starting pressure. Your
filter pressure reading will increase as it removes dirt from your pool. However, this build-up of pressure will
vary due to different bathing loads, temperature, weather conditions, etc.
h. MY ORIGINAL STARTING PRESSURE IS ___________ psi (pounds per square inch). I SHOULD
BACKWASH AT __________ psi.
Note: If the starting pressure after backwashing the filter or cleaning the elements indicates 4 to 5 psi higher
than the normal starting pressure, the filter elements must be cleaned. Refer to step 1, Cleaning the Filter
Elements, on page 7.
THIS FILTER OPERATES UNDER HIGH PRESSURE.
Never subject this filter to pressure in excess of the maximum pressure - even when conducting hydrostatic pressure tests.
Pressures above the maximum psi pressure can cause the lid to separate, which can result in severe injury, death or property
damage.
The following information should be read carefully since it outlines the proper manner of care and operation for your filter
system. As a result of following these instructions and taking the necessary preventative care, you can expect maximum
efficiency and life from your filtration system.
Preparing Diatomite
The filter requires diatomaceous earth (D.E. or diatomite) for proper
filtration and operation. Your filter elements must be precoated with this
material in order to protect their surfaces and provide the most efficient
filtering action. Refer to Table 2 for the proper quantity to use with your
filter. We recommend the use of D.E. which is sold and labeled for use
with swimming pools and spas. These grades of D.E. typically have a
median particle size of 34 microns, which is ideal for most applications.
1. FNS
®
Plus Vertical Grid D.E. filters are listed with the appropriate
amounts of diatomite to be used to precoat the filter elements. A
one (1) pound coffee can filled (level) with diatomite is equal to
one half pound weight of diatomaceous earth. Do not "pack" or compress diatomite into the coffee can.
2. Mix the required amount of diatomite with sufficient water in a bucket to make a thin, milky mixture.
3. Follow the instructions below in Coating Filter Elements with D.E. to introduce the slurry of diatomite into the filter.
Filter Area
(sq. ft.)
Table 2
Weight of
D.E.
No. of 1lb.
Coffee Cans
24 2.4 lbs. 6
36 3.6 lbs. 8
48
60
4.8 lbs.
6.0 lbs.
10
12
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