intex sand filter is not working on filter only working on recirculate position.....what should we do
Filter it, you need something to catch all the organisms your killing. The filter pump will still recirculate.
First of I think you may be referring to the pool filter not the pump. "Filter" runs the water thru the filter thus filtering the water. Recirculate, I believe, bypasses the filter media and sends the water back to the pool unfiltered. K
Clean the Filter!
I suppose. Was that the pressure when the filter was new of very clean? No 2 filters will be exactly the same.
This is what your filter gauge will read when it is first start with a new and clean filter cartridge / D.E. or sand.
Usually the pressure gauge on your pool equipment indicates how much pressure there is before the filter. as the pressure goes up it indicates that the filter is getting blocked and needs a backwash or cleaning. while the pressure is low the filter does not need cleaning.
You may need a new pressure gauge. They are inexpensive and can be found at any place that sells pool products. OR That may be all that you are going to get out of the system you have.
Your gauge could very well be bad, many pools that we took care of the gauge on the filter was bad, after backwashing the filter just check any of you lines going back to the pool and your should notice the pressure is a lot higher. A lot of people just check the flow by placing there hand at an outlet to check pressure than by walking over too the filter and reading the pressure, instead of buying a new pressure gauge.
As the filter gets clogged it restricts the flow of water and the pressure in the return line drops. The pressure gauge on the filter itself indicates the entry pressure and that will go higher as the filter becomes clogged. Don't ever allow the pressure to reach 40 PSI. Back-washing the filter should restore the pressures. Pool Masters
Back wash valve when the pressure before the filter becomes to high usually indicated in red on the gauge the filter needs to be back washed.
Recirculate allows water to circulate through the system but bypasses the filter. This allows one to keep the pool water flowing, and components like a salt water chlorinator running, even if the filter is broken.