I found your website and looked through some of the posts and started using PoolMath which seem to be very helpful.
I purchased a home with a rather large pool in December and am having some problems getting the chemistry right. The water generally looks, feels, and smells fine most of the time. There are dark stains or something in the imperfections of the pool surface.
The current levels using an HTC 6-way test kit are:
CYA: 45 (yesterday prior to adding about 5 lbs stabilizer, not completely dissolved)
The pump w/SWG at 100% has been running for about 22 hours. Iíve had to add bleach to keep the FC up, even with the SWG at 100% 8 hours per day. I tried to get a separate sample directly in front of the return jet, but only got a slightly higher level. Could my SWG cell be going out? As far as I know, itís about 9 years old. The previous owner said he gave up on using it and just kept adding bleach.
Does anyone have any advice?