Pentair filter - Manual (Page 6)

P/N 99223000 6 Rev. D 5-11-01
Problem Cause Remedy
Pool water not 1. Pool chemistry not adequate to inhibit algae growth. Maintain pool chemistry or consult pool service technician.
sufficiently clean.
2. Too frequent a backwash cycle. Allow pressure to build to 10 PSI above clean filter condition before
backwashing.
3. Improper amount or wrong sand size. Check sand bed depth and sand size or consult pool service technician.
4. Inadequate turnover rate. Run system for longer time or consult dealer or pool service technician.
Higher filter pressure. 1. Insufficient backwashing Backwash until effluent runs clear.
2. Sand bed plugged with mineral deposits.. Chemically clean filter.
3. Partially closed valve or restriction. Open valve or remove obstruction in return line.
Short filter cycles. 1. Improper backwash. Backwash until effluent runs clear.
2. Pool chemistry not adequate to inhibit algae growth. Maintain pool chemistry or consult pool service technician.
3. Plugged sand bed. Manually remove top 1" surface of sand bed and chemically clean as required.
4. Flow rate too high. Restrict flow to capacity of filter.
Return flow to pool 1. Obstruction in the pump hair and lint pot. Clean basket in strainer.
diminished, low filter
pressure. 2. Obstruction in pump. Disassemble and clean pump.
3. Obstruction in suction line to pump. Clean skimmer basket. Remove obstruction in lines. Open valves in suction line.
Sand returning to pool 1. Broken underdrain lateral. Replace broken or damaged laterals.
2. Backwash rate too high. Reduce backwash flow rate.
Section VIII. Winterizing the Filter.
1. In areas that have freezing winter temperatures, the pool equipment must be winterized to protect it from damage.
2. Backwash the filter. Shut off the pump and set the control valve to the winterize position.
3. Remove the drain port cap at the bottom of the filter.
IMPORTANT NOTE
Remove drain port cap only for draining water from filter. Removing the entire fitting will allow sand to drain also. Do not
remove the entire fitting on the 18" filter. This will damage the filter. The filter will drain slowly. Leave the drain port cap
off and store it during the time the system is shut down.
4. Drain all appropriate system piping.
5. It is recommended that the pump and filter be covered with a tarpaulin or plastic sheet to inhibit deterioration from the
weather. DO NOT wrap pump motor with plastic.
CAUTION
The control valve should be left in the winterize position during the shutdown season so that the rubber seal of the valve diverter
has no pressure on it. Failure to do so can damage the valve diverter seal which can cause property damage from leaking water.
Section IX. Troubleshooting.