Healthy Ponds 51116 Aquasphere Pro Biodegradable Pond Treatment, Treats up to 500,000 Gallons Natural bacteria and enzyme blend reduces excess nutrients, sludge and ammonia, resulting in improved water quality and clarity Treats up to 500,000-gallon Provides 24/7 water conditioning for 30 days Saves time and effort, with no mixing, measuring or mess Safe for humans, pets, fish, birds and plants Treatment with microbials requires oxygen to establish bioremediation Microbial treatments will reduce water oxygen levels as bioremediation occurs Bioverses microbial products are 100% natural, safe, and effective for fish in pond since there is enough oxygen for all fish contained in pond Ponds with high fish levels should have mechanical aeration systems during treatment for improved results Ponds with low oxygen levels should be treated with a water oxygenator prior to microbial application Low oxygen levels will produce localized fish death in any pond High heat will decrease the oxygen levels in ponds (as water temperatures increase the oxygen levels will decrease) Ponds overstocked with fish will have lower oxygen levels than a pond that has no fish Excess amounts of organic debris will lower water oxygen levels Shallow ponds will always have lower water oxygen levels than ponds that are deeper