The water is clean and there are no problems with debris so I think something else is happening. Just to make things clear about my situation I would like to explain that my valve on my sand filter leaks to backwash pipe when the valve is in the filter position. I installed a gate valve to stop the leaking but did not fix the spider valve at the time since the pool company said that the gasket on my multiport valve was not replaceable in my sand filter. I don't know if this could be related to my issue now or not but my flow rate decreases sooner than it use to and I find myself backwashing more often it seems. The sand filter is a Hayward S220T. the sand to my knowledge has never been changed and it would be 4 or 5 years in service. I don't know if changing the sand would be advisable or not. Any suggestions would be appreciated. Thanks Jim
Water flow slows too soon after backwash
- Thread starter fishcrazy
- Start date
Have you done an OCLT? Many times the water will be clear and almost sparkly at the very start of an algae bloom, yet your filter will clog up fairly quickly.
Post your current test results, full set, then do the OCLT.
http://www.troublefreepool.com/content/136-perform-the-overnight-fc-chlorine-loss-test-oclt
Post your current test results, full set, then do the OCLT.
http://www.troublefreepool.com/content/136-perform-the-overnight-fc-chlorine-loss-test-oclt
Haven't done a OCLT but will tonight. I have been maintaining the FC at between 3 and 6 as the daily test dictate. Ph is kept at 7.5 to 7.7 and it stays pretty stable in that area. I rarely have to increase it. Pool place said it is about time that I should change the sand in the filter(about 5 years) as it gets worn by now and doesn't filter as effectively. Is there anything to that? Thanks for the reply.
Sand is millions of years old, it does not wear out in a filter where it is rarely even moving (only during backwashing).