Minimum pressure for effective filtration?

[jeffr47]

I just finished replumbing my system. I have a new Hayward VSP2302 with a Apollo VA-52 DE filter. During the refit, I replaced 3 elbows with straight runs and the remaining 3 elbows with sweeps. I have a Flowvis flow meter on the system.

So my question: if I dial the RPMs on the pump down to about 1000 rpm or so, the PSI on the filter drops to 0. I know I'm getting flow - the meter shows 20 GPM and I can feel it in the nozzles. Is there a minimum flow needed for effective filtration, or is this just showing me that I'm getting flow with minimal resistance and all's well?

 

[mknauss]

Filters work best at low flow rates. So there is no minimum flow.
There could be a minimum flow for skimming.

 

[jeffr47]

Right, and I also have a check valve that needs a minimal flow rate to open as well. I'll just watch it and see what performance I get at lower pressures.

 

[Jimrahbe]

Jeff,

What is the check valve for??? You might think about taking out the guts and see what effect that has on your flow...

Most check valves are not required...

Jim R.

 

[jeffr47]

The check valve is part of the flow meter, so can't be removed. I don't need a check valve in this system, I know. Also know I don't need the flow meter, but I like having the information with the VSP.

 

[Jimrahbe]

Jeff,

If you want it, that is all that matters...

Thanks for the feedback,

Jim R.