Pentair STA-RITE SAND DOLLAR Installation And User Manual page 15

Problem
Pool water not 1. Pool chemistry not adequate to inhibit
sufficiently algae growth.
clean.
2. Too frequent a backwash cycle.
3. Improper amount or wrong sand size.
4. Inadequate turnover rate.
Higher filter 1. Insufficient backwashing.
pressure.
2. Sand bed plugging with mineral
deposits.
3. Partially closed valve or restriction.
Short filter 1. Improper backwashing.
cycles.
2. Pool chemistry not adequate to inhabit
algae growth.
3. Plugged sand bed.
4. Flow rate too high.
Cause
Maintain pool chemistry or consult service technician.
Allow pressure to build to 10PSI above clean filter
condition before backwashing.
Check sand bed depth and sand size or consult pool
service technician.
Run system for longer time or consult dealer or pool
service technician.
Backwash until effluent runs clear.
Chemically clean filter.
Open valve or remove obstruction in return line.
Backwash until effluent runs clear.
Maintain pool chemistry or consult pool service
technician.
Manually remove top 1" surface of sand bed and
chemically clean as required.
Restrict flow to capacity of filter.
Action