Using variable speed pool pump with SWG

[Rockman59]

I am considering converting to a variable speed pump. The vendor says I will save a lot of money my electric bill. They want to program the pump to run 7 hours a day at 1750 rpm and 3 hours a day at 2750 rpm. Now the question....is this enough time at the 2750 speed for my Intelichlor IC-40 SWG to make enough chlorine for my pool? I currently have a one speed pump that runs 8 hours a day at 3450 rpm and does the job. I am concerned that 3 hours a day at the 2750 speed and 7 hours at the 1750 setting will not produce enough chlorine for my 40,000 gallon pool. Comments please. And thank you in advance.

[mas985]

Pump speed has almost nothing to do with chlorine production as long as the minimum flow rate requirements are met. If 8 hours is enough for your old pump, 8 hours should be enough for your new pump. But the vendor's schedule is a little overkill in my book. 1-2 hours at 2500 and 7-6 hours at 1000 RPM should be enough run time (8 hour total). Most VS pumps have peak efficiency around 1000 RPM so I would target most of the run time around that.

[Rockman59]

mas985.....thanks for the info.

[Rockman59]

Currently running the variable speed pump at 7 hours at 1750 and 3 hours at 2750 and the IC 40 is making plenty of chlorine. I am considering cutting back to 7 hours at 1000rpm and 2 hours at 2500 rpm. I live in the SoCal desert where right now the highs are in the mid 90s which eats up the chlorine. Any comments?

[mas985]

Sounds reasonable. You may find that you can cut back even further.

[CarlD]

Interesting. Not familiar with VS pumps (only 2spd pumps). My SWCG can actually be wired to control the pump and the pump speeds, but I keep it simple, personally.