I thought I should update things with a bit of news and some thoughts. First, the pool continues to look great. It is crystal clear, but I'm beginning to think that clarity isn't everything. Because the water is so clear now, I'm beginning to see some slight traces of what looks like green on the floor of the deep end. But -- like I mentioned, slight traces. Still, I don't care how slight they are, I'm somewhat concerned. I've tried scouring the floor with my brush and it doesn't seem to have any effect.
Yesterday, I checked the filter's pressure and it was up from 2 psi previously to 4 psi, so I decided to clean it. Well, it wasn't as dark as the old filter would get, but it definitely needed cleaning. And the dirt that was coming out of the filter was definitely green-tinted dirt. So even though I'm not seeing anything more than slight traces of green on the pool floor, apparently the pool vac is vacuuming up enough such that the dirt is green.
It is the wee hours of the morning as I type this. I was gonna start an OCLT test tonight, but I fell asleep. So I'll do one tomorrow night. I suspect it's gonna show that I have active biologicals. And this is where I have a question. Since I haven't dosed the pool with chlorine in about 10 days, I'm gonna have a low FC number. So if I SLAM, the PoolMath app is gonna tell me I need -- I dunno -- possibly 3 gallons or more of chlorine. I'm just wondering do I need to SLAM when my pool's clarity is excellent, even though it's showing evidence of algae? I mean, I'll SLAM if I have to, but hooboy, that's gonna be a LOT of chlorine. Or is there another procedure that doesn't involve using the trichlor-laden pucks or bags of shock to kill these traces of algae?
It's also been over a week since the last time I did a full test of the pool's water, so I'm overdue in that respect too. I've been putting it off because we've had rainy and overcast days these past few days and I recall the advice I was given on how to accurately determine CYAs -- I need sun for that test, and we haven't had any sunny days lately. The forecast for tomorrow is for more overcast, so I dunno. Maybe I should do the rest of the test and not wait until a sunny day for the CYA test. I can always do the CYA separately, I suppose