filter problem


Old 05-16-05, 11:15 PM
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filter problem

New old pool owner, have a 32x16 above ground, 4 feet deep, 1 hp vortex pump and hayward sand filter model 711 (top piece atleast). Ran the filter all weekend after shocking. Came home to fairly clear water but very low suction and return flow. Back washed for 15-20 min slight improvement but several back washing attempts could not get back to where it started. Water flow during back wash seems low, not forceful at all. Tried vacuming threw filter, lowers suction to next to nothing. Got a good start on vacuming bottom threw waist line. Strong suction but still could not get it all. The glass bulb in the filter is always clear, except during recirc, got sandy. Also having problem with leaking out back wash tube during filtering. Changed gasket in vari flo, top piece of filter. (Always shut it off before turning valve). Pool store clerk said the spring was fine. Installed closing valves on backwash tube to stop leaking. Pool store clerk said to check the top of the sand in filter for crystalizing from hth shock. Seemed ok. Any suggestions? How long should back wash take? Thanks
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Old 05-17-05, 08:20 AM
Join Date: Nov 2004
Location: USA
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Sand filters can build up a layer of debris within the sand bed, I have seen it quite solid & up to 2”thick. Screw off the glass bubble on the top of your filter and put your hand in there, push your hand down 6” or so or until you hit a hard layer. Then break it up with your hands. ( (do not use a pole or any type of rod to push down and break up the debris ,there are laterals in the bottom of the filter and they can break off)) Screw the lid back on back wash again.
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