Dear Chris,1.     Add ...

Dear Chris,

1.     Add standard, white household vinegar to your  pond  if the  pH  testing kit reveals a  pH that's above 7.5. Use 1/4 cup of vinegar for every 500 gallons of water in your  pond . The acid in the vinegar helps neutralize the alkalinity and  lower  the  pond  water's  pH levels.

2.     Add carbon dioxide hydrates in water to form carbonic acid, which dissociates to hydrogen ion and bicarbonate (HCO3 - ): CO2 + H2O ⇌ H2CO3 ⇌ H+ + HCO3 -

3.     Using herbicides to kill algae and plants will eliminate high pH problems, but the benefits are often not worth the risks and costs.

4.     Tests were conducted to determine the effectiveness of calcium sulfate, calcium chloride, calcium carbonate, acetic acid, and ground corn for the control of high pond pH..

5.     Application of ground corn did significantly reduce pH at all levels tested.

6.     Sulfate-reducing bacteria (SRB) to be added in pond.

SO42- + CH3COOH + 2 H+ → HS- + 2 HCO3- + 3 H+  

7.     Nitrifying bacteria – Breaking down aquarium waste and reduce pH