It is a Hayward sp714TE and the sand hasn't been changed for 12 years. But the puzzling part is that the water pressure from the nozzles in the pool is still very low even on the recirculate setting which is supposed to bypass the filter.
SOURCE: Problem with vari-flo multipoer 1.5 and Hayward DE fiilter
You need a rebuild kit for the valve and possible a sand change. Sand should be changed ever 3 - 5 years or so depending on overall pool conditions.
The gasket inside the valve is out of place and therefore allowing water to leak out the waste port. Use a gokit to replace all the gasket/orings and you should stop the leak.
If the flow is still bad, inspect the sand and change it if necessary.
SOURCE: hayward filter problem
YOUR HANDLE IS NOT SEATING IN THE RIGHT POSITION THERE IS A SPROCKET UNDER HANDLE THAT MAY BE DAMAGED TRYSETTING HANDLE TO DIFFERENT POSITIONS SEVERAL TIMES IT MAY HAVE DEBRIS UNDER IT MAKE SURE PUMP IS OFF.TAKE HANDLE ASSEMBLY OFF AND CHECK SPOCKET
SOURCE: pool sand filter noisy only on filter setting and
Something is stopping your water flo before the filter otherwise you would show pressure on the filter guage. The only thing that I can think of would be if you had taken your backwash valve apart and reassembled it in the wrong position. Ether put the handle on backwards or mounted the top out of place. Hope this helps, good luck.
SOURCE: What setting should I have my Hayward Sand Filter ...
Your pool filter should be set on "filter" for normal vacuuming. If you have a heavy debris load or an extremely dirty pool, you might want to vacuum with the "waste" setting, if your filter has one.
SOURCE: Low flow
The model number you give is for the multi port valve. Did you need the valve manual or the filter manual? Go to haywardnet.com for their full line and manuals. Here is the link for the SP0714 valve at their site. It is in PDF format...
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