For dave it looks like the pump is already running quite long, much of the time that solar power is available. So there is not really an option to run longer and thus slower. It would be a thing only if not that much filtering is needed.
4hrs per day. I just lowered that to 3hrs.
Correct, running longer outside of solar periods defeats the purpose unless we had battery storage.
So you have circulation for only 3 hours a day? When I had a pool that wouldn't be enough to keep all the airborne crud filtered out, or to keep the pool chlorinated properly. But that was an old pool using trichlor, and with no automatic cleaner for the bottom. I guess things are a lot different with a modern pool.
That is similar to the point I was just going to make.
Years ago we bought our current house.
When we first looked at it, we were delighted to see a large, quite recently installed saltwater pool, & were surprised that the house was cheaper than others without a pool.
Unbeknownst to us, the previous owner had been "conned" with a saltwater chlorinator which was inadequate for the job, requiring almost constant operation to produce enough Chlorine to be within the safe level.
After battling with the original setup for some years, where most of the time we still had to add additional chlorine, we "bit the bullet" & bought a new, heavier duty pump & chlorinator.
It wasn't the "magic bullet" to fix all my woes, though, & there were still "issues".
Everybody else in the family had become disenchanted with the pool, & I ended up becoming the "pool boy".
Eventually we got it ripped out.
Anyway, the point was that you can play with speeds till you are "blue in the face", but it is the efficiency of the chlorinator in a saltwater pool which is the determining factor.
That said, I don't know if Dave's pool is a saltwater type or something more exotic.