Pool water balance and guidelines

The balance of the pool water is determined on the basis of simultaneous measurement of temperature, pH, calcium hardness and total alkalinity. Calculation of the water balance gives an idea of whether the pool water is aggressive or whether it will cause limescale deposits.
 

An index value above +0.5 gives	- lime-precipitating water.
	- cloudy water and limescale deposits on the walls, pipes etc of the pool.
An index value below -0.5 gives	- aggressive water.
	- irritation of the eyes and mucous membranes, as well as attacking the   mechanical equipment of the pool.

 

The index value is calculated with this formula:

Index value = pH+TF+CF+AF-12.1
 

pH	pH
TF	Temperature Factor
CF	Calcium hardness Factor
AF	Total alkalinity Factor
12,1	A constant

 
See the table below for the factor for each parameter in the formula.
 
We recommend the Autocheck III photometric test kit for determining the water balance. This is in order to obtain an exact value for each parameter in the formula.
 
 
 

Temp °C	TF	Calcium hardness mg/l CaCO3	CF	Total alkalinity mg/l CaCO3	AF
20	0,52	25	1,00	25	1,40
22	0,56	50	1,30	50	1,70
24	0,6	100	1,60	70	1,86
25	0,62	120	1,68	80	1,92
26	0,64	140	1,76	90	1,96
27	0,66	150	1,80	100	2,00
28	0,68	170	1,84	120	2,08
30	0,72	200	1,90	150	2,20
32	0,76	250	2,00	200	2,30
34	0,8	300	2,10	300	2,50
41	0,9	400	2,20	400	2,60