Water Change Calculator

	A	B	C	D	E	F	G	H	I	J
1		Nitrate (ppm)	% of Water Change	Nitrate Content After WC	Nitrate Accumulation Between WC	Nitrate Accumulation Since Last WC	% of Water Change	Nitrate Content After WC	Nitrate Accumulation Between WC	Nitrate Accumulation Since Last WC
2	Tank #1	80	20	8	7	15	25	11	7	18
3	Tank #2	1	10	5	5	10	10	9	5	14
4	Tank #3	10	25	8	10	18	25	13	10	23
5	Tank #4	100	75	25	60	85	75	21	60	81
6	Tank #5	200	85	30	90	120	85	18	90	108
7	Tank #6	200	95	10	90	100	95	5	90	95
8	Tank #7	400	95	20	40	60	95	3	40	43
9	Tank #8	100	25	75	60	135	25	101	60	161
10	Tank #9	100	85	15	80	95	85	14	80	94
11	Tank #10	200	25	150	130	280	25	210	130	340
12	WATER CHANGE CALCULATOR						Created by Tony Griffitts
13	This chart is used to figure out how often and how much water you should change in your aquariums.
14	DIRECTIONS:
15	Enter your data in the first three yellow colored fields then press tab. The other fields will automatically calculate and fill in. Green numbers indicate that the nitrate content is less than 100 ppm in the calculated fields. Orange numbers (WARNING) indicate that the nitrate is rising (but less than 100 ppm) with the numbers you entered and the schedule needs to be adjusted, if not the nitrate levels will eventually reach the danger zone. Red numbers indicates that nitrate is in the danger zone above 100 ppm and the schedule you entered needs to be adjusted. A good schedule will have all green numbers in the calculated fields.
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