Water Changes

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Water Changes How Many Gallons

Water Changes are recommended to prevent build-up of treatment chemicals, salts, etc. But remember, if you use a buffer or salt, their concentrations will also be reduced!

The following table shows residual concentrations as a function of water changes. To use the table look down to the number of water changes, and then across to the % change made each time. For instance, if you have made 5 water changes of 15% each, you have reduced the original concentrations to a residual of 44.4%.

Residual Concentrations after # of water changes

Water Change #

10%

15%

20%
1 90.0%

85.0%

 80.0%
2 81.0% 72.3% 64.0%
3 72.9% 61.4% 51.2%
4 65.6% 52.2% 41.0%
5 59.0% 44.4% 32.8%
6 53.1% 37.7% 26.2%
7 47.8% 32.1% 21.0%
8 43.0% 27.2% 16.8%
9 38.7% 23.2% 13.4%
10 34.9% 19.7% 10.7%
11 31.4% 16.7% 8.6%
12 28.2% 14.2% 6.9%
13 25.4% 12.1% 5.5%
14 22.9% 10.3% 4.4%
15 20.6% 8.7% 3.5%
16 18.5% 7.4% 2.8%
17 16.7% 6.3% 2.3%
18 15.0% 5.4% 1.8%
19 13.5% 4.6% 1.4%
20 12.2% 3.9% 1.2%
21 10.9% 3.3% 0.9%
22 9.8% 2.8% 0.7%
23 8.9% 2.4% 0.6%
24 8.0% 2.0% 0.5%
25 7.2% 1.7% 0.4%
26 6.5% 1.5% 0.3%
 

Best Pond Filters Filtration Basics Order Form Filter Media Pre-assembled Filter Operation Pictures Info Links Gravity Drainage Ultima II Fluid Art Aqua Dyne Comparison Koi Water Quality Keyword Search Table of Contents

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