Pentair Modular DE Filter PLDE48 - Manual (Page 6)

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valve, close the valve.
NOTICE: Leaking around the Posi-Lok™ ring may indi-
cate that the ring is not fully locked. In this case, pro-
ceed as follows:
a. Stop the pump, close the isolation valves, and
open the air release valve to release any pressure
within the filter.
b. Remove the drain plug and drain all water from the
filter.
c. Push down on the top of the filter to fully seat the
upper tank shell.
d. Rotate the Posi-Lok™ clockwise until it locks be-
hind the safety latch (see Figure 3).
e. If the ring was already locked, remove it and the
upper tank shell. Inspect and clean the O-ring and
all sealing surfaces. Relubricate the O-ring.
NOTICE: Lubricate O-ring only with the silicone grease
provided or equivalent, as other lubricants may cause the
ring to swell. DO NOT lubricate
Posi-Lok™ ring or threads on lower tank shell as this may
collect grit and make removal difficult.
7. To prepare precoat slurry, mix diatomaceous earth (DE)
and water. DO NOT use more DE than recommended.
NOTICE: Using more than the recommended amount
of DE will clog the filter. Using less than the recom-
mended amount will give an uneven precoat and
shorten the life of the element.
8. Empty slurry slowly into skimmer to precoat filter ele-
ment with an even filtering precoat.
After filter is operating, record filter pressure gauge read-
ing in owner's manual for future use.
NOTICE: When installed on a new pool, after approxi-
mately 48 hours of operation disassemble filter and clean
out plaster dust , construction debris, etc. (see “Module
Cleaning Procedure", Page 8).
CLEANING THE FILTER
When to Clean:
NOTICE: If installation does not allow backwashing, use
module cleaning procedure regularly (see Page 8).
1. With a new filter:
a. Record filter operating pressure at startup. When
pressure reaches 10 PSI (69kPa) above startup op-
eration pressure, stop pump for 30-60 seconds to
allow filtering cake to release.
b. Restart pump to form new cake. Pressure should
now be less than 10 PSI (69kPa) above startup op-
erating pressure.
c. If pressure is still more than 10 PSI (69kPa) above
startup operating pressure, backwash filter (see below).
2. Thoroughly clean air bleed assembly on top of filter
module EVERY time filter is opened. Be sure to remove
all debris from screen. Replace screen if damaged.
3. At least twice a year, manually clean filter module ac-
cording to instructions, Page 8. At least once a year,
follow instructions under “Special Cleaning
Instructions”, Page 8, as well.
Filter Backwash Procedure:
To prevent equipment damage and possible
injury turn pump OFF before changing valve position.
NOTICE: Before backwashing with a separation tank, review
separation tank owner's manual for instructions.
1. Stop pump.
2. Change valve position.
a. If using Multi-port Valve, set it to backwash position.
b. If backwashing with a Two Position Slide Valve, push
handle to full down position.
3. Start pump and run it for 3 minutes.
4. Stop pump and open tank bottom side drain.
NOTICE: A 1-1/2” drain valve is recommended.
5. Start pump and run 1 minute, backwashing through fil-
ter valve and tank drain.
6. STOP PUMP, return filter valve to filter position and
close tank drain.
NOTICE: Do not vacuum pool while backwashing filter.
7. Compare pressure reading on gauge with reading
recorded after initial startup. The two readings should
be very close; if not, do "Module Cleaning
Procedure", Page 8.
FILTER DISASSEMBLY/
ASSEMBLY PROCEDURE
Hazardous pressure. Before disassembling
filter:
1. STOP PUMP.
2. CLOSE isolation valves.
3. OPEN air release valve and drain fitting.
4. WAIT until all pressure is released and water drained from
filter tank and system before loosening Posi-Lok™ Ring.
Disassembly:
1. Stop the pump.
2. Close isolation valves to prevent flooding.
3. Open air release valve on top of filter tank to release all
pressure from inside of tank.
NOTICE: Make sure that waste water disposal complies
with local codes and ordinances.
4. Remove drain plug and drain all water from tank.
Hazardous pressure.
Can cause severe
injury or major
property damage
from tank blow up.
Release all pressure and
read instructions before
working on filter.