O-Ring
Drain Straw
Filter
Screen
O-Ring
Sump
Head
12
Routine Maintenance
CLEANING THE FILTER SCREEN
It may be necessary to manually clean the filter screen from
time to time. On water supplies that contain sticky sediment
including mud, silt and clay, you may have to remove the
sump and clean the screen frequently. Also, if the ASF has
not been automatically flushing for any reason, such as a
dead battery, a larger amount of sediment than normal may
have accumulated in the sump. In this case it is recom-
mended that the sump and filter be cleaned manually (an
excess amount of sediment could plug the valve).
1
. Before shutting off the water supply (as directed in Step
2), run a bucketful or sinkful of water to use for cleaning
the filter screen.
2
. Shut off the main house water supply valve upstream from
the Automatic Sediment Filter.
3
. Open a cold water faucet in the house (downstream from
the ASF) to depressurize the system. Then close this
faucet again
4
. Remove the sump by turning it to the left to unscrew it
from the ASF head (See Figure 18). Be prepared for
water to drip out of the ASF head when the sump is
removed.
5
. Remove the filter screen assembly by pulling it down out
of the ASF head (See Figure 19).
6
. Using the water you saved in Step 1, wash the filter
screen assembly. If necessary, gently scrub the filter
mesh with a soft brush to remove material from the pores.
7
. The drain straw may have come out of the ASF head
when the sump and filter screen were removed. If so,
reinsert it into the small hole at the center of the head
assembly (See Figure 19).
8
. Make sure the o-ring is in place on the filter screen
assembly (See Figure 19). Make sure that no sediment
particles are on the o-ring or the corresponding sealing
area in the head. Slide the filter screen over the drain
straw and into the corresponding hole at the center of the
ASF head. Push it in to engage the o-ring seal.
9
. Make sure the large o-ring is in place on the sump (See
Figure 19). Make sure no sediment particles are on the o-
ring, sump threads or corresponding threads in the ASF
head. Slide the sump over the filter screen and screw it
into the ASF head to seal. Do not overtighten.
10
. Open a cold water faucet in the house downstream from
the ASF.
11
. Turn the main house water supply back on.
12
. Close the faucet that you opened in Step 10 after air has
been expelled from the system and water is flowing
smoothly with no spurting.
13
. Check that there is no water leaking from the sump
threads. Tighten sump if necessary.
Turn to the
left to remove
Sump
FIG. 18
FIG. 19
Turn to the
left to remove
(with water shut off)
Sump
Sump
O-Ring
Head
Drain Straw
O-Ring
Filter
Screen
