Sand Filter at 37-40 PSI (help?)

[Guywhoistoobusy]

Thanks for all of the great responses and pointers. Here's what is still going on...

The gauge is now completely pegged. I had the pump off during a cold spell here, and while it was off, the gauge went to zero. But within hours of being back on, the gauge was pegged (over 60PSI).

When I cut over to the main pool drain, no water pulls through into the pump. You can see there is no water in the filter cover and the pump starts making loud noise. When I cut back over to skimmer basket, it corrects.

I have backwashed, rinsed, and reset the multiport valve to filter.


My stabilizer is at 120 and minerals are very high. I am going to drain the pool and then see about taking apart the drain. After thinking about the components and the complete system, I think it's a clogged drain (or pipe) and possibly old/clogged/calcified sand in the filter. I think that starting here will get it going.

[mas985]

It is impossible for the pressure to reach 60 PSI so it sounds more like a bad gauge. For some gauges, the maximum PSI is actually 30 PSI. Are you sure that it is hitting 60 PSI? If so, replace the gauge because it is not reading correctly.

When I cut over to the main pool drain, no water pulls through into the pump. You can see there is no water in the filter cover and the pump starts making loud noise. When I cut back over to skimmer basket, it corrects.

That means there is a blockage in the main drain line. Are you sure there isn't a plugged somewhere.