I just wanted to say how happy I am to have found this forum. I've felt very lost and overwhelmed with my pool and its nice to have such a good source of information.
We have a 12,000 gal pebble-tec pool, with a sand filter and a heater. We were using trichlor pucks for chlorine, but I have now switched to using liquid chlorine. I have the DPD kit from Leslie's - I have a FAS-DPD kit on order but it hasn't arrived yet.
The pool was fine until 2 weeks ago when it got very cloudy and green over a few days. I figured it was algae, so I decided to shock it according to the advice on this forum. My initial readings were:
FC: 0 ppm
TC: 0 ppm
TA: 100 ppm
CH: 550 ppm
CYA: somewhere over 100 ppm
I superchlorinated to about 25 ppm (as best as I can measure with my kit by diluting it. By the morning it had dropped to about 20 ppm, so I bumped it up again and repeated this for a few days and the color got much less green and more blue, but still very cloudy. I started this June 6, by June 13 it was blue and a bit clearer.
Then I might have made a mistake. Since the stabilizer and hardness were so high, I drained the pool down a foot and replaced the water last night. My new readings are:
FC: 12 ppm
TC: 12-15 ppm (not sure)
TA: 130 ppm
CH: 475 ppm
CYA: 100 ppm
So not the dramatic results I was hoping for but a small drop in CYA at least. The pool is still blue and cloudy. My question is, what do I do now? Replace the water again to bring the CYA down more? Apparently my fill water has a high TA (I tested the tap water at 160 ppm), is that going to be a problem? Do I keep shocking it until the pool clears? I really don't know what to do and I'm already panicking about the water and power bills for this month.
Thank you very much for any advice!