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Fibreglass Filters Installation and commissioning

BEFORE INSTALLATION

(A) Please check for transit damage examine exterior and interior of case, underdrain, sockets, candles an ladder system.  If any damage is apparent Do Not Install - request replacement. Check all screws as shown in diagram and check air bleed for positive solvent welding into underdrain. If loose DO SECURE (if filtration commences with loose fittings sand will pass through.

(B) Please check site position. A solid level based site for the filter with sufficient room for adequate plumbing is necessary.

(C) PLUMBING. It is important to fit the pipework accurately to the filter sockets.  DO NOT hang the filler from the pipework. Forcing or springing the pipework to the sockets MUST BE AVOIDED. D0 NOT USE THE PIPEWORK AS A MEANS OF CLIMBING over the installation or as a ladder which will place undue stress an the pipework and the filter,

(D) LID FITTING see diagrams,  CLEANLINESS AND CORRECT  LUBRICATION  ARE   ESSENTIAL. Correct sealing will be obtained by screwing down until the joint surfaces meet on the o ring,  then tightening one third more. N.B the 'O' ring must be seen to remain stationary whilst finally tightening. IN  DEFAULT  REMOVE 'O'   RING  FROM  LID. RE-VASELINE AND REPEAT  PROCEDURE.

{E) After installation backwash filter (4 minutes average} until water appears clear,   switch off pump and manually re-tighten lid,  only a small movement may be possible. ONLY  VASELINE  IS RECOMMENDED FOR LUBRICATION.  JOINTING COMPOUND OR GREASE  MUST  NOT BE  USED.

(F) FINAL CHECKS. Before finally closing the filter check the sand level and remove or add sand  as necessary.

(G) WINTERISING. Those filters laid up during winter may be drained by removal of the exterior drain plug cap (anti clockwise). This will automatically drain the filter without sand loss. Flushing out the sand can be achieved by burrowing down through the sand bed and pulling of  the cap from the drainplug filter stem.

• NOTE Only backwash if the water is clean and free from debris and algae, otherwise this will result in plugging of the underdrain system. If this is the case put the filter directly onto filtering cycle.

	Dryden filters are suitable for removing suspended din particles from water at high speed, efficiently and economically, in both fresh and salt-water conditions. Dryden filters are constructed from totally corrosion resistant materials to ensure trouble free running and prolonged life.  Each filter is rigorously pressure tested to the highest standards and certified as correct prior to leaving the factory.
	IMPORTANT Prior to running, check that all valves are in the correct positions. NEVER: attempt to alter valves without first stopping the pump - or in any way subjecting the system to a closed head situation.
	FILTER CYCLE Contaminated water is pumped in through the top inlet port and distributed via the head pipework system, thus creating a uniform flow through the media bed. Dirt particles suspended in the water will penetrate and become embedded in the media, allowing the cleaned water to pass through fine slots in the collector assembly. The water is then returned to the pool via pipework connected to the bottom outlet port. The effectiveness and efficiency of the filter is impaired by excessive build up of debris, clogging the media, which will result in pressure build up and poor circulation. In this respect, we recommend that a suitable calibrated pressure gauge be installed on the pressurised pipework between the pump and the filter. Increases in the normal running pressure of approximately 2S-30 per cent will indicate that BACKWASHING or cleaning of the media is required.
RINSE CYCLE; This may not be incorporated on all systems; but is designed to level the media bed and expel any foreign particles from inside the collector assembly. The flow through the filter is in the same direction as for the normal filter cycle with water used being exhausted to waste via the valves and pipework. The rinse cycle only requires 10-20 seconds running time to produce the correct results.	BACKWASH CYCLE; Backwashing or media cleaning is achieved by reversal of the water flow through the filter to waste and is activated by re-positioning the valves.  It is most important that water used on the back-flush cycle  is free from algae and debris.  Waste pipework should be kept as short as possible with a bore size the same as or greater than the filter inlet-outlet ports. Any restrictions or pipework bends will reduce the efficiency of the backwash procedure. The effect of backwashing can be clearly observed through the filter lid and when first commenced the purged water will become extremely cloudy. Gradually this will change and after 2-3 minutes the water will clear completely, leaving the media free of debris, at which point the backwash procedure can be stopped and the system re-set for the normal run or rinse cycle.