Here's my case:
Taylor 2006C results:
FC 1.0 (decreasing fast)
pH 6.8 to 7.0
TA 150 (was 180 to 200)
CH 550 to 575
CYA > 100, with dilution technique: 100-120
First of all, I would like to thank all those responsible for running this website. It has been very helpful and educational.
I read all the materials on the website and finally got my Taylor 2006C kit. Above are my results.
Brief history of the pool:
Over 20 years old.
8000 gal pool
Oasis shape with plaster walls.
Hayward pump with cartridge filter and chlorine tablet feeder.
Owner has been taking care of the pool for many years with just Trichlor 3" tablets and Cal Hypo shock treatment.
Owner stop using liquid chlorine many years ago. Found it cumbersome. Owner is elderly.
Pools color last week was slighty bluish-green in color with yellow algae on walls.
There is also a white cloudy substance in the pool.
Pool has been suffering with algae rebounding constantly.
Cartridge filter gets dirty a lot with milky filtrate and needs to be cleaned weekly.
Owner has a polaris and no vacuum.
Owner shocks with Cal Hypo and then uses clarifier to remove cloudiness.
Owner repeats this process every week or 2 weeks.
I recently received all of my supplies (liquid chlorine, borax, bicarb, etc...) but after seeing the results, I realize that my CYA, CH, and TA are high. I'm assuming that I have a case of chlorine lock based on the long term use of Trichlor and need to drain or dilute the pool. It has been many years since the pool has been drained or resurfaced. I have been able to make the pool blue again by dosing the pool with some liquid chlorine but the algae aggressively returns. I have also been able to reduce the TA levels by aerating the pool. CYA and CH are my biggest problems and I don't feel like wasting my products until I refill the pool. I'm assuming this would be the next logical step?
I would like to hear some recommendations and comments. Thanks.