Page 16
JS Series Sidemount Sand Filters
Troubleshooting Guide
Fault Symptom
Possible Problems
Solutions
Water is not clear.
Insufficient disinfectant level.
Incorrect pool chemistry.
Heavy bathing and/or dirt loads.
Insufficient running times.
Incorrect size or amount of sand.
Backwashing too frequently.
Check and adjust disinfectant level.
Test and adjust water chemistry.
Adjust filter time and/or water chemistry.
Increase pump run time.
Check sand freeboard and sand size or
consult with pool service professional.
Before backwashing, allow filter pressure to
increase 10-12 psi above "Clean" pressure.
Low water flow and low filter
pressure.
Filter system strainer baskets dirty.
Air leaks on suction side of pump.
Restrictions or blockage in either suction or
return lines.
Filter is Dirty.
Pool water level too low.
Pump not primed.
Pump impeller vanes blocked.
Strainer baskets not being used and/or
broken. (Allow debris into pump.)
Pump operating under speed (low voltage).
Check and clean strainer baskets.
Check all connections between pool intake
and pump.
Check all lines for debris or partially closed
valves.
Backwash or clean sand filter per instructions.
Fill pool so level is above pump inlet line.
Fill pump with water at basket and replace lid.
Technician required.
Replace baskets.
Technician or electrician required.
Short filter period between
backwash events.
Presence of algae clogging filter.
Incorrect water chemistry.
Pump output exceeds design flow rate of
filter.
Ineffective cleaning.
Check disinfectant content.
Check pH, total alkalinity and TDS.
Check pump performance.
Clean or replace sand or filter media per
in struc tions.
High pressure on start-up.
Small eyeball fitting in Pool/Spa.
Partially closed valve on return line.
Too large of pump.
Sand bed clogged.
Incorrect size of sand.
Replace with larger diameter fitting.
Check and fully open all valves on return line.
Check pump and filter selection.
Dig our top 1" to 8" layer of sand bed
and discard. Replace with new sand and
chemically clean the filter. See Section 3.5
for proper sand size, and Section 5.3 for the
Chemical Cleaning Procedure.
See Section 3.5 for the proper sand size.
NOTE: If the sand is too fine, the laterals may
become clogged. Clean all slots in the laterals
before replacing the sand.
Dirt returns to pool.
Channeling or void tunnels occurring
through the sand bed.
Insufficient backwash flow. Check pump
performance. Backwash the filter to resettle
the sand bed surface.
Sand appearing in pool.
Broken lateral(s).
Too much filter media in the filter.
Air vent tubing is dislodged (breather tube).
Backwash valve installed incorrectly.
Air vent screen is missing.
Replace damaged lateral(s). Carefully follow
instructions in Section 3.5, Filling the Filter with
Sand.
Check the media level per Section 3.5 and 3.6.
Reattach tubing to fitting at internal outlet
piping.
Refer to backwash valve instructions.
Replace air vent screen.
Sand loss to waste during
backwash.
Backwash flow rate too high.
Incorrect sand size or quantity.
Reduce backwash flow rate to flow indicated in
Section 2.4, "Specifications and Dimensions".
Change to proper sand size and verify
freeboard distance is correct.
Summary of Contents for JS Series
Page 2: ......