Pool Pilot

[tsuma]

Uhm, this maybe a stupid question, but how do you figure out what your flow rate is? I have a 2-speed pump.

I notice that my flow rate drops when the DE filter needs a cleaning (showing ~10 psi higher backpressure at that point compared to when it's clean).

The flow switch that we use is rated for 13 - 15 gpm minimum flow. Actually the specs indicate that the flow switch will deactivate at around 13 gpm, but may require 15- 19 gpm to fully activate. Having said that, it's difficult to specify what the minimum flow is other than giving you a general answer of "make sure you've got at least 20 gpm minimum".

[Poolsean]

Not at all a stupid question.

It is determined by going to the manufacturers flow charts, figuring out your total feet of head, and plotting the flow chart for high speed and low speed.

Everyone's pump should have a flow chart to get this information.

[steveinaz]

Absolutely, my SWCG is maintaining 9ppm FC at 10% output right now, running 8hrs a day.