PP,
There are only a couple of things that you can control..
1. You should have the SWCG by-pass shut off so that all the water goes through the SWCG.. (In your latest pic it appears to be off.. like you want..)
2. Your Heater by-pass should be set so that just a trickle of water goes through the heater and that most of the water does not. Obviously, if you want to use the heater, then you can't have it by-passed...
3. Keeping your filters clean will help keep your flow higher..
4. On both of your pool and spa returns there is a gray ball valve that is not fully open.. It should be fully open..
Other than that, your plumbing is what it is...
I have no idea why you have two filters instead of one very large cartridge filter, but that is what you have. Does not make any sense to me..
The slowest speed you ever want to run is the speed that turns on your SWCG's flow switch plus about 100 RPM, just to make sure.
Do you know what HP your main pool put is??? It will be either 1.5 or 3 HP
I run my 3 HP IntelliFlo at about 1200 RPM and that is plenty fast enough to run my SWCG and allow the pool to skim well.. I can do that as I have no heater. When I am running at 1200 RPM, my filter pressure is about 1 lb. on a 30 lb. gauge.
You should be able to do close to the same thing if you have your heater mostly by-passed.. Even with a heater in line, I would think that you should still not have to run more than 1600 to 1700 RPM.. to turn on the cell..
Was your pool green? Did you are anyone else use Clarifier or Floc??? Did you clean the filters or did the pool guys clean your filters?
I see another different issue.. In your latest pic, your cell has good flow and good salt but is not making any chlorine??? Not sure why you would ever want to run the pump and not be making chlorine???
Let's see if we can get Mark to look at your set up and see if he can spot anything causing your flow issues... Calling
@mas985
Thanks,
Jim R.