Pond was looking good - was happy last fallw when pea soup changed into nice furry coating of string algae and clearer water. Spring-same. Waiting til july to get install new equipment and put in fish. No time now. But then. Acccidentally poured in dechlor w ammonia neutralizerthinkinv it was mineral supplement for plants. Freaked thinking it would mess up nitrify cycle and chamged out half water . Now week later string algae dyingand disintegrating lots of debris particles. What did i do??? Am i basicly at beginning again with cycling of my pond?? My 1st inclination is always to empty pond and start over but this time i want to understand what happenedfirst.