Ok, I am still digging, so this is a question for "a few weeks" from now.
My vinyl pool will hold about 25,500 gallons, plus about 300 for a spillover spa. Once filled and balanced, I'll be using an Aqualogic system to maintain the chlorine level. The best source of water for filling will be a pond near the pool. I plan to pump the pond water through the sand filter (maybe with a little DE added) while filling to remove as much of the suspended solids as I can.
Since the pond water undoubtedly contains some algae, I want to treat it as soon as I get it into the pool. I know the Aqualogic won't be of any use at this point, the pond water will have zero CYA, and I'll most likely be filling on a hot, sunny day. My question is what is the most efficient way to get the new water under control and avoid unnecessary problems and wasted chemicals?
My pool kit came with an inline chlorinator for use with trichlor which I originally did not plan to use. I could use it with trichlor until the chlorine and CYA levels are where they need to be. Or I could try to dissolve the amount of CYA I need as quickly as possible right off the bat and use bleach to get the chlorine level up. I'll test the pond water before filling to get an idea of just what it will need for ph and alkalinity. Also, I can't think of any reason not to add the salt for the swcg right from the start.
I had a vinyl pool at a previous house and made all the possible mistakes with it. This time I want to be smarter, and starting from scratch with a new pool I have no excuses for not getting it right.