I'm a 3 year pool owner. First year after learning a ton on this forum I had a breeze handling the pool. It couldn't had been easier.
Last year I replaced a motor on my superpump to a 2 speed. The wet end stayed the same. When the FC levels would get closer to the lower end I would get hazy water. It also happend when filter pressure was on a higher end so the GPMs were lower.When I was runing pump on high, I wouldn't back wash at those numbers yet and things were fine. I guess on lower speed the flow is more affected by lessed raise in the pressure.
So I attributed my problems to lack of water mxing and having some areas with lower levels of FC. It happend this year again. This time filter was just backwashed, so the GPM drop was minimal.
I checked the FC in 5 different spots, incluing some 3 feet under. They all were fine. Still hazy water. Here are the numbers:
CYA - 30
FC - 3.5 at 11 am today, 4 yesterday at 7pm. I usually get 0.5-1-1.5 ppm drop per day depending on sunlight amount. 80% of the pool is covered with solar cover.
CC - 0
For my CYA the good range is 2-6. With filtering on high speed I touched the lower end of the range on multiple occasions without any hiccup. Borates might've added some extra protection.
With lower speed filtering I feel that if i let it drop below the middle of the range (4ppm in this case), I'm flirting with troubles.
I will stick with keeping it at higher end of the range from now on. But I'm wondering if someone sees something wrong with my approach and can offer me some advise.
P.S. I think my pool is a bit smaller than I think since I've been overshooting the numbers here and there. Old owner told me it was 27k, but I calculated it to be about 30k. So I used this number. We had Andrea drop a lot of water 2 days ago and now it's full to the brim. I introduced 11.6 ppm of chlorine (72 oz of 65% CalHypo) and instead of brining the level from 3.5 to 15.1, it brought it to 16ppm. That's after 15 minutes of mixing on high.