new plaster

[deepnnet]

Thank you for your responce. sorry for taking so long to reply,I've been
really busy the last couple of days.
Let me make the question more clear.
How soon after a new white plaster pool is filled (fill water @ 50ppm)
should calcium be adjusted? If left unchecked , the calcium will rise on
it's own during the 4-6 week curing process.(I've seen it go as high as 300)
Note: I do keep the pH low ~7.0 during this time to battle the rising
alkalinity.
Should I add calcium right after fill? will that halt further calcium release
from the new plaster? Or is the plaster going to release more calium anyway (low pH)
and possibly end up with very high levels at the end of the curing process
and possible scaling problems?
Thank you very much! Rick aka deepnnet

[mas985]

If this is not the first fill after new plaster, then I would go ahead and raise the calcium to 200 ppm.

If it is the first fill after new plaster, then I would drop the PH to 6.8-7.0 and after a 3-4 days, test the water and if the CH is still below 200 ppm and most of the plaster dust is gone, then I would add calcium.

Plaster dust can add quite a bit of calcium to the water and it is actually good to start a new plaster pool with a low calcium level since this will dissolve much of the plaster dust and save a bit of time vacuuming it out. Dissolving the pool surface due to low calcium levels is a very slow process so I would not worry too much the first week. But after that, if it is still < 200 ppm, then I would go ahead and add calcium.

[deepnnet]

Thanks Mark thats all I needed to know!
Rick