6
MEDIA LOADING
Models NSAPFSSA & NSAPFXLA, as manufactured,
have no media in the tank. Before plumbing the unit,
load gravel, sand and mineral (See table on Page 3
for amounts):
1
. Move the filter into installation location and set it on
a flat, level surface.
2
. Take off the unit’s top cover and unplug the wiring
connections between the valve and the control
board (PWA).
3
. Remove retainer clips and clamp sections from the
tank neck and carefully lift the valve off the tank.
4
. Check the height of the riser pipe, as shown in
Figure 2.
5
. After confirming the riser pipe height, remove the
top distributor from the tank neck, leaving the bot-
tom distributor (including riser pipe) in place, cen-
tered in the tank.
6
. With a pail or hose, fill the tank with 1-2 feet of
water. The water acts as a cushion to protect the
bottom distributor while filling the tank with gravel
and media.
7
. Cover the top end of the distributor tube with a
clean rag, to keep gravel and media out (See Fig. 3).
8
. Using a larger neck funnel, add the recommended
amount of gravel (See Page 3. ) Be sure the dis-
tributor remains centered.
NOTE:
When coarse, medium and fine gravels are
specified, add in that order.
9
. Add the recommended amounts of sand and min-
eral (See Page 3). Use water sparingly to speed
flow through the funnel (It may become necessary
to siphon water from the bottom of distributor if
tank becomes full of water).
10
. Flush the tank opening with water to clean media
particles from the top of the tank. Uncover the
bottom distributor stand tube.
11
. Finish filling the tank with water, up to the top of
the tank.
IMPORTANT:
Be sure to fill with water. This will elim-
inate air space, wet the media and pre-
vent excessive air-head pressure when
filter is pressurized.
12
. Install the o-ring seals and top distributor exactly
as shown in Figure 4. Place the small o-ring at
the top of the riser pipe, where shown in Figure 3.
If the o-rings need lubrication, use a high quality
silicone grease.
13
. Lower the valve assembly onto the tank, center-
ing over the riser tube. Push downward, against
the o-ring, and install the clamp sections, securing
with the retainer clips.
14
. Reconnect the wiring between the valve and the
control board (PWA).
15
. Verify that the drain flow plug (See Key No. 59 on
Page 23) is appropriately sized for the media
used. If necessary, install a different flow plug.
Note:
Resin tank height can vary somewhat within manu-
facturing tolerance. So that the bottom distributor riser pipe
has proper clearance with inside valve porting, check for
the correct length, as shown above. Cut the riser pipe if
needed to adjust the length. Be sure to remove burrs and
sharp edges.
Top Edge of
Top Distributor
Riser Pipe
0” to 1/2”
FIG. 2
FIG. 4
Top
Distributor
Bottom
Distributor
Riser Pipe
O-Ring, 2-7/8” x 3-1/4”
Make sure o-ring
sealing surfaces
are clean
O-Ring, 13/16” x 1-1/16”
O-Ring, 2-3/4” x 3”
Media Loading - APF Models Only
FIG. 3
Funnel
Plug or cover top of
distributor tube
Tank
Make sure
bottom distributor
is centered
