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Hi Tom (CNJ_EC), Here are pictures of the valve handle assembly, with the orientation aligned with pictures I posted before: The bigger hole pointed to by the screw driver is in the compartment corresponding to the "closed" position. The top compartment corresponds to the "filter" position...

Thank you Piolin for the inputs. I was suspecting something like that too... Forest

I want to give an update about my diagnosis of this old sand filter. CNJ_EC has been extremely helpful and we had talked over the phone. I have not tried all the ideas I received from here, since water clarity has been okay by maintaining good chlorine level. But after 2 months from my original...

Hello duraleigh, My statement about sand was bold. I agree a sufficient filter area and a proper sand level is important for the best filtration performance. For the purpose of diagnosis of my filter, my assumption was that a filter with less sand should still "operate". I mean it should...

Hello CNJ_EC 1) I am ignorant about bleeding the filter's "air valve". Not sure if I have one... Sounds interesting. Could you educate how this is done? The pressure gauge changes almost instantly when I switch between different multi-port valve positions, but this is probably not what you are...

Thank you Piolin. Your experience is very helpful. I am interested in trying adding DE through the skimmer and see if any cloud of DE comes out of the return.

Yes I have looked at this link to Deep Cleaning a Sand Filter. My understanding is the "deep cleaning" dislodges the debris from the bottom of the sand bed. But my sand all looks like new when I checked It would be very useful if there is a practical and effective way to check if a filter is...

I did take the sand out to expose the metal screen. It looks like stainless steel, shiny, with no rust at all. It is also mechanically very strong. I actually like this design more than the plastic laterals. If the filter is clogged, I would expect the pressure in "filter" mode be higher than...

I have been reading this forum for two years and found it very valuable. For my own pool, water looks good and I am happy with my water clarity, but I suspect my old 1975 Hayward 22-inch sand filter is not working well. I want to avoid the trouble and inconveniences with a broken filter. I am...

The results were from a pool store. Will get my own test and try the shock method here. thanks for all your suggestions!

I was wondering about the laterals but after I opened the filter it turned out my filter doesn't have any laterals. There is a large metal screen at the bottom of the sand. So I think that serves the same purpose as the laterals. I don't have problem of sand coming back to pool but I suspect...

Pooldv, Thanks for the links! I will study them :) I updated my test results. Also I saw no improvement in water clarity after shocking it a few days ago. That makes me think it is a filtration problem.

Hello! As a new pool owner I very much hope to get crystal clear water, but my pool always looks dull. The picture shows the best I can get so far. (sorry the orientation of the pictures. They look right on my computer but got rotated when posted here). I did the dime test. On the deep end (~7...