Water Changes

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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%

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