too much suction?

[quick89]

I have a 30x15x5 15,000 gallon pool with a cartridge filter and 1.5hp pump. The pump produces adequate pressure when first turned on and will keep that pressure for a little while. However, it always drops down and ends up outputting a very low amount of water until I turn it off and turn it back on.

The inlet line becomes collapsed from what I assume is too much suction. Should I replace this line with some hard PVC piping?

 

[JasonLion]

Rigid PVC would be ideal, but you could also use some higher quality hose or flexible PVC if that would be easier.

Unless that is very cheap hose, a suction collapse like that usually suggests that there is some kind of blockage somewhere (skimmer?) raising the suction.

 

[quick89]

I replaced the inlet line with rigid PVC and have had stable high pressure all day! Is there any benefit to replacing the return line with rigid as well?

 

[JasonLion]

Rigid PVC will last a lot longer.