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Old 05-22-2010, 08:36 PM   #1
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Can I use pure vinegar to drop my ph for my water changes

Can I use pure vinegar to drop my ph for water changes. The ph of my tank is 8.4.The water I am going to use for my water change has a ph of 8.8.
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Old 05-23-2010, 10:01 AM   #2
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You can, but I would not recommend doing it. How big of a water change are we talking about? If you did a 20% water change with water that is 8.8 pH and your tank is at 8.4, the water change will only bring the pH in the tank up to 8.48.
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Old 05-23-2010, 10:56 AM   #3
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I usually do 5 gallon water change a week for my 75 gallon

I usually do a 5 gallon water change a week for my 75 gallon. Is that sufficient. The last week of the month I'll do two 5 gallon changes.Usually about 5 5 gallon changes a month.
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Old 05-23-2010, 12:46 PM   #4
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5 gallons a week is only about 7%. You should be doing 15-30%.
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Old 05-23-2010, 01:03 PM   #5
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I would suggest a 10% weekly or 20% every other week schedule for PWC's. Some do more, many do less, but there's no denyng the benefit of a PWC.

So think about upping your weekly schedule to 10 gallons. Pick up a 20 gallon Brute (by Rubbermaid) trash can to mix the water.

But first, what are you using for source water? Tap?

a RODI unit will strip all buffering capacity out of the water as well as most everything else. Then your salt mix should get you to the ~8.2 range.
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Old 05-23-2010, 01:43 PM   #6
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You can, but I would not recommend doing it. How big of a water change are we talking about? If you did a 20% water change with water that is 8.8 pH and your tank is at 8.4, the water change will only bring the pH in the tank up to 8.48.
Larry, how did you come up with "8.48"?
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Old 05-23-2010, 02:21 PM   #7
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I guess the easiest way to explain it doing a 20% change is....
8.4pH x .8 (80% of remaining water) = 6.72
8.8pH x .2 (20% of new water) = 1.76
100% = 8.48 pH
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Old 05-23-2010, 04:13 PM   #8
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Thanks Larry
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Old 05-24-2010, 01:27 PM   #9
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I only have 3 fish,Two yellow tails and a maroon clownfish. I have a 75 gallon tank with 105 pounds of live rock and 60 pounds of live sand to go along with 15 pounds of argonite. My nitrate levels have ben 5 ppms and below for the last month. If I add more fish I may up my daily changes to 10 gallons a week. I change 25 percent of the water monthly. I use RO/DI water. I have a four stage system.
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Old 05-24-2010, 04:15 PM   #10
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I guess the easiest way to explain it doing a 20% change is....
8.4pH x .8 (80% of remaining water) = 6.72
8.8pH x .2 (20% of new water) = 1.76
100% = 8.48 pH
pH isn't linear... it's logarithmic... so I don't think it works like that. I think. Maybe.
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