Hi all! I have been following the Slam method since converting my pool from baquacil to chlorine This is my 4th summer using chlorine.. I have never had to slam except upon opening until tonight. The water has been crystal clear and I have never let my chlorine levels fall below the min. levels. I test nightly and dose accordingly for the next day.
Today I decided to get in and give it a good brushing, the walls, floor and ladder. Imagine my surprise when I tested this evening and I had a significant drop in chlorine. I normally dose to 8 at dusk and lose between 2.5-3 ppms during the day, leaving me at about 5 the next evening. I tested tonite and only had about 3 ppm's of FC and 1cc. That's quite a drop for my pool.
I know what to do thanks to this forum and started the SLAM.
My current numbers are: FC 21.5
CYA 50 (pool in full sun all day)
I have been dosing to my shock number of 20 every hour until midnight and will check it first thing in the morning. The first hour I lost 6 ppm's, the second hour I lost 3 and the third hour I actually gained about 1.5 (freshly bought chlorine).
I am wondering if all the brushing could have stirred up something that has been there all along, just refusing to show itself? Maybe I had some bad bleach that just wan't quite as strong as it said? I dunno. The water has always remained crystal clear and sparkly. Oh well, thanks to everyone on this site I know what to do and I GOT THIS!!