	CO₂ volume (mg/l) depending on the carbonate hardness (°d) and pH value (in accordance with KRAUSE)

		Too much CO₂							Correct CO₂ levels							Not enough CO₂
		Too much CO₂							Correct CO₂ levels							Not enough CO₂
		pH value

KH (°d)		6,0	6,1	6,2	6,3	6,4	6,5	6,6	6,7	6,8	6,9	7,0	7,1	7,2	7,3	7,4	7,5	7,6	7,8	7,9	8,0

1		32	25	20	16	13	10	8	6	5	4	3	3	2	2	1	1	1	1	0	0
2		64	50	40	32	25	20	16	13	10	8	6	5	4	3	3	2	2	1	1	1
3		95	76	60	48	38	30	24	19	15	12	10	8	6	5	4	3	2	2	1	1
4		127	101	80	64	51	40	32	25	20	16	13	10	7	6	5	4	3	2	2	1
5		159	126	100	80	63	50	40	32	25	20	16	13	10	8	6	5	4	3	2	2
6		191	151	120	96	76	60	48	38	30	24	19	15	12	10	8	6	5	3	2	2
7		222	177	140	111	89	70	56	44	35	28	22	18	14	11	9	7	6	4	3	2
8		254	202	160	127	101	80	64	51	40	32	25	20	16	13	10	8	6	4	3	3
9		286	227	180	143	114	90	72	57	45	36	29	23	18	14	11	9	7	5	4	3
10		318	252	200	159	126	100	80	63	50	40	32	25	20	16	13	10	8	5	4	3
11		350	278	221	175	139	111	88	70	55	44	35	28	22	18	14	11	9	6	4	3
12		381	303	241	191	152	121	96	76	60	48	38	30	24	19	15	12	10	6	5	4
13		413	328	261	207	164	131	104	82	65	52	41	33	26	21	16	13	10	7	5	4
14		445	353	281	223	177	141	112	89	70	56	44	35	28	22	18	14	11	7	6	4
15		477	379	301	239	190	151	120	95	76	60	48	38	30	24	19	15	12	8	6	5
16		508	404	321	255	202	161	128	101	81	64	51	40	32	25	20	16	13	8	6	5
17		540	429	341	271	215	171	136	108	86	68	54	43	34	27	22	17	14	9	7	5
18		572	454	361	287	228	181	144	114	91	72	57	45	36	29	23	18	14	9	7	6
19		604	480	381	303	240	191	152	120	96	76	60	48	38	30	24	19	15	10	8	6
20		635	505	401	318	253	201	160	127	101	80	64	50	40	32	25	20	16	10	8	6

The values which are highlighted in green are the optimum values for healthy, strong plant growth. As regards the use of the table: The carbonate hardness is measured, e.g. 8 °dH and you search for a medium CO₂ value e.g. 25 mg/l. Then you can read the corresponding pH value of 7.0 at the top. In the event of a KH of 15 then a medium value of 24 mg/l CO₂ and a pH value of 7.3 would be correct. And in the event of a KH of 2 and 25 mg/l CO₂ then one should attempt to achieve a pH of 6.4 or set it as the target value on the pH controller.