I tried peroxide for the first time this year and it does seem to help. Also lots of plants in a bog work. Years ago I added barley and wasn't happy about the rotting mess it created.The theory behind barley in the pond is that it produces hydrogen peroxide as it decays. Best to skip the decaying part and just add hydrogen peroxide in my opinion!
Just curious, but did you mean 700 gallons?What type of barley do you prefer or would recommend to use? Bales, Pellets or Liquid. My pond has a long waterfall, but isn't real big, approx. 7,000 gallons at little less than 2 ft. deep.
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