Ok Thank you all. So if The pond is 300 gallons and I do a 10% water
change weekly (30 gallons) and the declor is 1 drop per gallon. Do I
just add 30 drops to the pond? Or will this not work? I know it works if
added to 30 gallons of water and then put into the pond, but what if I
just add 30 drops into the pond after putting in 30 gallons of tap
water? Hmmmmm LOL thank you