changing pool water

[boscoe]

Richard,
thanks for the reply.
Yes, we do have a pentax cartridge filter with 4-3" cartridges. We cleaned them after a year and are starting a 2 month cleaning routine. Before cleaning them our readings were as follows:
hardness-1000, total chlorine-5, free chlorine-3, ph-7.8, total alkalinity-240 and cyanuric acid-300 with aquacheck select test strips. Its 9000 gallons with a heater and has pebbletec lining.
We rarely get rain here in Arizona. We have never used any anti scaling products because I can't find a reliably reccomended product I have faith in.
I drained 800 gallons a day reducing the level about 4" every day allowing the make-up water refill it for a week before my little giant transfer "pony" pump broke. The cyuranic acid came down a bit to the maximum 300 reading.
The pool is too big for a cover. I am considering using the chlorine tablets as needed until it gets cooler in November and draining it half way with a commercial pump (3000 gph) and refilling it. I stopped adding the tablets to the skimmer and now fill the dispenser and we are holding the chlorine at the ok level for almost a week.
What is a multiple silage bag method?
Will there be any harm in just using more chlorine with the high cyanuric acid level until November?
The water is about 4 years old.
Dan

[aylad]

You can try using more chlorine, but you're going to have to keep it in the 8-10 ppm range at all times (that's for 100+ CYA), and even that may not be enough. It might help if you use some polyquat 60 as well. No guarantees, but I guess it's worth a try. You do need to stop using the tablets, though--they are raising your stabilizer even higher and soon the CYA will be too high to compensate for even with high chlorine--if you're not at that point already.

Janet

[boscoe]

ok, I'll try the polyquat60.