Pentair FNS Plus User Manual

FNS® Plus

Fiberglass D.E. Filter

By Pentair Pool Products

®

The  lter that delivers crystal clarity

Filtering with diatomaceous earth (D.E.) gives you water
that really sparkles. That’s because D.E. f ilters remove the
tiniest of contaminants…particles as small as 5 microns.
(An average grain of sand is 1000 microns!) Even though
these particles can’t be seen individually, collectively they
greatly affect water clarity.

Here’s why diatomaceous earth filters work so well. Water
passes through a series of D.E. coated grids. Under a
microscope, D.E. looks like a collection of tiny sponges. And
just like a sponge, water can pass through, but microscopic
impurities like dirt, algae, and some forms of bacteria can’t.

FNS® Plus D.E. Filters have been designed with curved grids
to maximize filtration area. More filter area means better
performance and longer periods between cleanings. Our
exclusive internal design has been refined to minimize  ow
restrictions, and therefore requires minimal pumping power
to achieve a needed  ow rate. That means lower utility costs.

In addition to providing the clearest possible water, FNS Plus
was also designed for easy maintenance and long-term
reliability. So you can count on it to keep your pool’s water
clean and crystal clear for years to come.

●

Curved vertical grids provide maximum filter surface area
for greater dirt-trapping capacity and longer periods
between cleanings.

●

Unique internal design ensures optimum filtration and
backwashing efficiency.

●

Chemical resistant, fiberglass reinforced polypropylene tank
for exceptional strength and long life.

●

Easily removable filter grid pack to simplify maintenance
and save you time.

FNS® Plus Fiberglass D.E. Filter

Corrosion-resistant fiberglass tank
for long life

TM

Tension Control
secure closure

2" plumbing connections for
maximum  ow

Conveniently located 1½" drain
for easy and efficient cleanout and
100% draining

Model Filter Vertical Filter Flow Rate GPM Turnover Capacity (Gallons)

Number Area Sq. Ft. Clearance* Diameter Res.** Com.*** 8 hours 10 hours 12 hours

FNSP 24 24 48" 21.5" 60 48 23,040 28,800 34,560

FNSP 36† 36 62" 21.5" 90 72 34,560 43,200 51,840

FNSP 48† 48 74" 21.5" 120 96 46,080 57,600 69,120

FNSP 60† 60 86" 21.5" 150 120 57,600 72,000 86,400

clamp for

The culmination of 40 years of
pool  lter experience

The FNS® Plus filter’s time-tested design offers you maximum
performance, convenience, and reliability for year after year of
sparkling clear pool enjoyment. No wonder more than 2 million
Pentair filters have been installed by pool professionals.

●

Attractive almond-colored tank blends into any

backyard environment.

●

High FlowTM manual air relief valve and continuous internal air

relief work together to maintain efficient filtration and prevent
over-pressurization.

●

Easily accessible 2" drain for efficient cleanout.

●

One-year limited warranty. See warranty for details.

† NSF Listed.
* Required clearance to remove  lter elements.
** Maximum flow rate.
*** Flow rate is based on 2.0 GPM per sq. ft. of
filter area. Actual system  ow will depend on plumbing size and
other system components.

How a D.E. Filter Works

When diatomaceous earth (D.E.) is introduced into the filter system, it coats
the filter cloth. As water passes over the filter grids, the D.E. particles capture
even the smallest suspended dirt par ticles. When cleaning is needed, the
water  ow is simply reversed.

Available from:

www.pentairpool.com
Phone: [phone] Fax: [phone]

pumps / filters / heaters / heat pumps / automation / lighting / cleaners / sanitizers / maintenance products

9/05 Part # P1-091

©2005 Pentair Water Pool and Spa, Inc. All rights reserved.