Pump advice

[FLIPPERNUT]

I recently purchased a new multiport valve assembly only to discover that my filter leak is coming from a crack in the filter body. Will be ordering new body today, but I'm worried that the crack was caused by previous owner's change from 3/4 hp pump to 1.5 hp pump. I obviously don't want my new filter body to suffer the same fate.

I've tried researching the right size pump for my setup but my head is swimming. Do y'all think that the higher hp pump was too much for my 22" diameter filter? Really can't afford to buy a new pump right now on top of everything else, but may have to find a way if I'm at risk of ruining the new one. It could be that I just need to change the impeller size as I don't know what is on there.

i realize that additional info may be required for an informed response. Your input would be appreciated.

 

[AftonJeeper]

I thought that all the single speed pumps spun around 3450 RPMs. Going from 3/4 to 1.5 should have made the pump more efficient and not increased the flow.

Anyone else know?

 

[pooldv]

A 1.5 hp single speed pump is certainly more pump than you need and costs a lot to run. But, it won't develop enough pressure crack the sand filter. You could change the motor to a 2 speed motor and run it on low most of the time. The filter would be more efficient and it would use 25% of the electricity on low as it uses on high and move half the water.

But, you are fine to run it as is for now, it won't damage the filter housing.

 

[FLIPPERNUT]

Thanks, y'all. Just what I needed. Not only is the 6 y/o filter body cracked, but the entire plumbing setup shakes when I first turn it on like it's about to take flight. The previous owner said the pool electric bill doubled when he changed to higher hp so will downsize or get a 2-speed as soon as I can.