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6. TROUBLESHOOTING
The table below identies some of the main issues that may be encountered with your sand lter. This should assist
in solving most of the major problems. It is highly recommended that regular maintenance of your swimming pool
equipment, including the sand lter, be performed by a qualied pool professional. This will extend the life of your
equipment and give better performance.
Problem Cause Action
Sand entering the pool
Sand size is too small and getting through laterals Change sand
Flow rate on the pump is too high and pushing sand
through laterals
Adjust ow rate
Sand bed calcied due to poor water chemistry Adjust chemistry (pH balance)
Broken lateral Repair
Loose center-pipe Re-tighten
Too much sand in the tank Reduce sand level
Multiport valve not correctly positioned in the lter Remove and reattach correctly
Too much air in the lter Purge air
Sand coming out of waste line
Flow rate on the pump is too high and lifting sand too
high during backwash
Adjust ow rate, change the pump
as needed
Pool water is cloudy due to
poor ltering
Sand bed is dirty and requires backwashing Backwash to remove dirt
Incorrect sand has been installed Replace with correct specication
Algae build-up in the lter due to poor water
chemistry
Adjust chemistry (chlorine)
Calcied sand bed due to poor water chemistry Adjust chemistry (pH balance)
Heavy swimmer usage Backwash more frequently
Flow rate on the pump is incorrect for lter size and
pool size
Adjust ow rate, change the pump
as needed
Backwashing cycle is too short Increase backwash cycle length
Backwash line is too small restricting water ow Increase pipe size
Filter leaking water
Tank cracked Replace
Drain plug not tight Re-tighten
Valve to tank O-ring damaged Replace
Multiport control valve leaks
Handle is not properly located in selected setting Re-assemble correctly
Valve to tank O-ring damaged Replace
Valve cover O-ring damaged Replace
Pressure gauge O-ring damaged Replace
Abnormal loss of pool water
Leak inside control valve Re-tighten or replace as needed
Leak from pool or PVC piping Inspect, repair, replace
High pressure lter
Filter requires backwashing Backwash
Calcied sand bed due to poor water chemistry Adjust chemistry (pH balance)
Return lines too small for pump ow rate Increase pipe size
Low pressure in lter
Multiport control valve incorrectly set Re-assemble correctly
Pump ow rate is too slow Check speed and control valves
Air leak in pump suction Check seals and tighten as needed
Table D. Troubleshooting
CONTROLLED COPY approved for factory use on 4/16/2020. RAYPAK PROPRIETARY AND CONFIDENTIAL INFORMATION . Approval signatures on file in Engineering.