My water is clear, but I lose about 2.5-3ppm of FC overnight each night, and I'm adding more bleach than I (think I) should have to.
I'm generally trying to hold at around FC6 (CYA45), but after a long hot day (it's been over 100 here recently), I can find myself down to 1.5 or 2. At that point, like I've said in another thread, my vinyl seams darken and it appears I'm fighting algae again.
My pool light was black when I opened earlier this year, but cleared up when the pool did -- after about 55 gallons of 10%. However, now, if my pool gets down to the 1.5FC level, that light starts to blacken right back up. Obviously there's no circulation in or behind the light.
So, I loosen the light and pull it free; black particulate is flying everywhere, the light housing is rusted and there are holes and water in it (but amazingly, the bulb still works), and the niche (I think that's what it's called) is just covered in black stuff.
Obviously, replace the light and clean the niche, right? I'm on my fifth paragraph and now getting to my question: how do you do that? I can't lower my water far enough (12" remaining in the shallow end is about 3" above my light) without floating the liner -- do I just use a toilet brush and let the crud go its merry way in the pool water and then rock some "shock+" levels for a while? How do I get the algae that is invariably back in the conduit to the electrical box?
I want this stuff gone!