Davey CRYSTAL CLEAR FIBRE GLASS MEDIA FILTERS - Manual (Page 5)

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CAUTION:
Never shift the valve handle position while the pump is running.
This filter tank must not be operated under vacuum. Should leaf
baskets or suction lines become clogged, blocked or closed, filter
damage not covered by guarantee may occur (particularly if an
auxiliary pump is installed in line down stream of the filter).
Normal Filter Cycle
1. Set the valve to FILTER and start the pump.
2. With a clean filter, record the pressure gauge reading or mark the needle
position on the pressure gauge.
3. Operate the filter each day for a sufficient time to turn over the water in the pool
once every day. the filter should also be operated at all times the pool is in use
and for about one hour afterwards. During the winter, the running time may be
reduced.
4. When the pressure gauge reading is 40 - 50kPa higher than the clean filter
gauge reading as in (2) above, it will be necessary to clean or backwash the
filter (see section on Backwashing the Filter).
Backwashing the Filter
When the filter gauge reading is 40 - 50kPa above the clean filter gauge reading,
cleaning or backwashing is required. To perform the backwash operation:
1. Shut off the pump. Be sure to disconnect any automatic Vacuum Cleaner.
2. Shift the valve handle to BACKWASH.
3. Start the pump and run until the water appears clean through the sight glass
(this will take two or three minutes).
4. Shut off the pump and turn the valve handle to RINSE.
5. Start the pump and run for approximately one minute.
6. Shut off the pump and turn the valve handle to FILTER.
7. Start the pump; a new filter cycle has now begun.
8. If a backwash cycle does not reduce the operating pressure of the filter, the
media will need to be changed. Contact your local pool shop.
CAUTION: Most filter media contains dust and fine particles that
must be backwashed from media before filter is set to ‘Filter’.
CAUTION:
Never vacuum while backwashing.