Now that my pool is about a year old, I'm doing some upgrades that my original PB should have told me about but didn't. My single-speed pump is a bit noisier in the daytime than I like (plus I've read here that a 2-speed pump is more energy-efficient), so I'm going to swap it out for a Hayward 2-speed. My plan is to run it on the low speed for about 12 hours a day (double the time that I'm doing now) and only use the high speed when I'm adding chemicals. My current pump is 1.5 hp, and the new one will be 2 hp.
I also want to have an SWG installed. I read on this site today that it is best to run them during the daytime when the sun is actively dissolving whatever chlorine is in the water (makes sense). The new PB is going to install a Hayward system good for a 40K gallon pool and is rated to generate 1.4 lbs/day.
Does it make sense to plan on running the pump at low speed all day? Will that affect the efficiency of the SWG? I don't want to get this done only to find out that I have to run the pump at high speed during the prime part of the day when I want to be swimming - it will be even noisier than it is now! If that's an issue, will it work to run the pump at high speed during the night and on low during the day?
(if it makes a difference, I have a retractable cover that I usually close each night to retain heat and prevent evaporation.)