Pentair Meteor 20 Owner's Manual page 6

9. Stand clear of the filter and start pump.
10. The filter has now started its filtering cycle. Check that water is returning to the pool and take note of the filter pressure.
11. The filter pressure in step 10 above should not exceed the pressure originally observed on the filter when it was initially
started. If after backwashing the pressure is 4-6 psi above the start condition, it may be necessary to change the sand in the
filter.
12.Because the sand media bed is the key to efficient filtration in this type filter system that media bed should be visually
inspected at least once each year.
Over a period of time certain foreign matter and materials can become imbedded in the top of the sand media bed and will successfully
resist being flushed out during the backwash cycle. During inspection as noted above, this foreign material and any contaminated sand
should be removed from the tank. Replace any old sand removed with new clean silica sand. Replace tank lid or valve and carefully
follow instructions in Section II.C, Valve and Clamp Installation Instructions.
A. CONTROL VALVE FUNCTIONS.
1. Rotary type multiport control valves offer more operating positions and allow more options on how to direct the flow of water
in your pool system.
a. 8-Way Multiport valves provide all of the following functions, see Table 2.
FILTER From pump, through valve, downward through filter sand bed, back through laterals and piping to valve return
port, and back to the pool. This position is used for normal filtering and vacuuming to clean the pool water.
BACKWASH From pump, through valve, down through piping and laterals, up through filter sand bed to valve, and out
waste port. This position is used for cleaning filter by reversing flow.
RINSE From the pump, through valve, downward through filter sand bed, back through laterals and piping to valve
and out waste port. This position is used for start-up cleaning and resettling filter bed after backwashing.
WASTE From pump, through valve (bypasses filter) and goes to waste port. This position is for vacuuming directly to
waste, lowering pool level, or draining pool.
CLOSED NO FLOW IN THIS POSITION - DO NOT USE THIS SETTING WITH PUMP OPERATING.
RECIRCULATE From pump, through valve, bypasses filter and goes to return port and back to pool. This position is for
circulating water without going through filter.
SERVICE NO FLOW IN THIS POSITION - DO NOT USE THIS SETTING WITH PUMP OPERATING. It allows the
removal of the handle pin for servicing.
WINTERIZE For areas that have freezing temperatures during the winter.
Small grains of sand may leave the filter during backwashing or may even appear at the return line when filter is first
started up. This is characteristic of permanent media filters.
Always turn pump off before changing valve positions. CHANGING VALVE POSITIONS WHILE THE PUMP IS RUNNING CAN
DAMAGE THE CONTROL VALVE, AND MAY RESULT IN PERSONAL INJURY OR PROPERTY DAMAGE.
P/N • Núm/Pte. • Réf. 9 9 1 0 2 0 0 0
N O T E
TABLE 2
N O T E
W A RNIN G
6 Re v. C 5-1 1-0 1