Davey ECOPURE F14, F16, F18, F21, F25 & F28 Fibreglass Media Filters - Manual (Page 2)

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Function
The filter uses special filter sand to remove dirt particles from pool water. The
filter sand is loaded into the filter tank and functions as the permanent dirt
removing media.
When the control valve is in the FILTER position, the pool water which
contains suspended dirt particles, is pumped through your piping system and
is automatically directed by the patented filter control valve to the top of the
filter tank.
As the pool water is pumped through the filter, dirt particles are trapped
by the sand bed, and filtered out. The cleaned pool water is returned from
the bottom of the filter tank, through the control valve and back to the pool
through the piping system.
This entire sequence is continuous and automatic and provides for total
recirculation of pool water through your filter and piping system.
After a period of time, the accumulated dirt in the filter causes a resistance
to flow, so the flow diminishes. This means it is time to clean your filter. With
the control valve in the BACKWASH position, the water flow is automatically
reversed through the filter so that it is directed to the bottom of the tank,
up through the sand, flushing the previously trapped dirt and debris out the
waste line. Once the filter is back-washed of dirt, set control valve to RINSE
position and run pump for about 30 seconds to 1 minute, and then to FILTER
to resume normal filtering.
IMPORTANT: Turn pump off before changing valve position.
Installation
Only simple tools (screwdriver and wrenches), plus pipe sealant for plastic
adapters, are required to install and service the filter.
1. The filter should be placed on a level concrete slab, very firm ground, or
equivalent. Position the filter so that the piping connections, control valve
are convenient and accessible for operation and service.
2. Loading the sand media. Filter sand media is loaded through the top
opening of the filter.
a. Loosen flange clamp and remove filter control valve (if previously
installed).
b. Cap internal pipe with plastic cap to prevent sand from entering it.