Hello all. First post, long time viewer.
First some background... I built this pool 4 years ago, and have managed it myself since. I did the usual Trichlor/Dichlor chlorine feed for the first 3 1/2 years until I found this site. I also was sold on a Paramount Clear O3 when I bought the pool, of which crapped out this year and I haven't replaced it (I'm thinking of doing so, see below). I've been following the BBB for the past 6 months.
Here's my test results:
I've been battling the yellow/brown algae all summer. But, for the most part, my water has been swimmable and very nice all season. However, I seem to be adding much more chlorine this year and wonder if I just have never been able to get rid of what's growing. FYI, I have not done a true shock to the pool all summer. So, here's the question... well, actually a few questions...
1. Yesterday morning I added (6) 182ml bleach per the pool calculator for a shock. I did an OCLT last night and passed, but my FC levels were (and still are) very low. And, I still have a slight tinge of algae in the corners and in the shady areas. It wasn't very sunny yesterday, but could I have burned all my chlorine off during the day so my reading for FC showed low levels or did I not add enough bleach to get it to shock level? Do I need to keep shocking?
2. I've been cluing into my CYA, of which I have already done a 75% refill due to numbers well over 120 (during the Phoenix summer no less). When I tested after the refill, I read a CYA of 60. I tested recently, it read 30 (I tested it twice to make sure). My understanding is CYA only goes down by refilling. How long should I wait to verify CYA in another test or is there a chance I tested too soon after the refill?
3. Speaking of FC, I noted I've always used the ozonator, until it recently failed. I can't help but think my problems this year are in part because I don't have it helping the cause. I've always been able to get by with lower than the recommended FC levels, but I was never able to figure out why. I believe the ozonator shows some benefit. Maybe not so much in the heat of the summer, but during the shoulder seasons. I know this site disagrees with that, but has there been any solid evidence as to their lack of effectiveness?
4. I have a Taylor K 2005 test kit that appears to be restrictive in its ability to measure FC (the numbers only go up to 5). Is it possible to just rely on the pool calc and the OCLT results, or should I go get a recommended test kit? Right now, I have no idea if my FC levels go above 5!
Final question... I believe I have some form of algae that is not wanting to go away, and I'm about ready to shock to mustard algae levels just to make sure. Does this sound reasonable? Or, are there any steps I can take to see if I can get by?
As a side note, along with learning how to truly understand how to manage my pool myself, I've also taken up home brewing over the past few years. I find the chemistry in each area fascinating. Every time I learning something new, I feel I am even more confused. I guess this makes sense since I draw pictures for a living (golf course architect)...
Thanks in advance!