My pool is filling and it appears it will take quite some time (days) so when do I start adding bleach - the skimmer and return are not even installed yet and probably won't be until water level reaches 1/3 - 1/2. I don't want that water just brewing in there as it fills if thats what will happen - we are expected to be in the mid 80s to low 90s the next couple days, some miscellaneous insects (June Bug invasion) and debris have fallen in as filling - I have dipped out but I'm sure they left residue. We are only at about 4" water now.