good news,i think i got the formula from mark at wildlife & fisheries in baton rouge 225-765-2336/2337.call over there and they will be able to help you with converting your numbers to the correct formula.if you cannot get mark ask anybody in this dept.and they will find someone to help you.i've also seen it several times over the years on this site,wl&f might be the fastest way.got to thinking last night and a friend of mine put, i think about 200 pounds in a pond about your size with no luck,then something like 3-4 days later he added another 200 pounds and 2 day's later his water was clear.you can buy gypsum at dodge city farm supply in denham springs,i thing it's about 4-$5.00 per bag.