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Message: [QUOTE="WaterGardener, post: 530975, member: 11923"] That calculator will tell you how much to use. You have to fill in the areas that are listed there. Number of gallons that are in your pond, how much you want to raise the KH (carbonate hardness) and it will tell you how much to use. That page also says to not raise the KH by more than 20 ppm per day. So just fill in the blanks with the number of gallons, use 20 ppm for how much you want to raise the KH and it will give you the amount of baking soda to use. A pH of 7 is borderline. It won't take much to drop that back down in the acid range. Many of us here like to keep the pH at 8.2 or 8.3. And no, that is not too high. Anything above 10 is too high. But fish will live very well in a oH below 10. At 8.3, your pond has plenty of carbonate hardness (alkalinity) to buffer the acid that is normally produced by the nitrogen cycle and by heavy rain, which can be very acidic. So there is no chance of a pH crash when the KH and pH are .much higher than 7. The worst things you can have is a pH that swings up and down and having a pH of 7 is risking that. I just filled in the form for you. With 600 gallons of water, it will take just a smidge over 2 ounces (a quarter of a cup) of baking soda to raise the KH by one dro, 17.86 ppm. Not 20, but close enough and that was already on the chart so I went with it. So you need 1/4 cup of baking soda today. You can do it again each day until the KH gets to at least 100ppm. 200 is not too much. [/QUOTE]

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