BS POOL PRO 1000, Maintenance Manual

Page: 18 / 39

18
Hardness Conversion Tables
A conversion table appears below that shows the different units for measuring
hardness:
1 German degree 1 ppm of 1 English degree 1 French degree
CaCO3
1 German degree 1.00 17.8 1.25 1.78
1 mg/ l of Ca CO3
0.056 1.00 0.0702 0.1000
1 English degree 0.798 14.3 1.00 1.43
1 French degree 0.560 10.0 0.702 1.00
Classification of water according to its hardness
The most serious drawback of hard water is the precipitation of calcium and
magnesium salts that form incrustations. The pipes that hard water flows through,
whether hot or cold, become blocked with the consequent reduction in their
effectiveness. Pumping installations require higher power to obtain the same flow and
pressure conditions.
Hardness
(mg/L - ppm)
Hardness
(French degrees)
Soft
0-50 up to 5
Moderately soft 50-100 up to 10
Slightly hard 100-150 up 15
Moderately hard 150-200 up to 20
Hard 200-300 up to 30
Very hard > 300 > 30
Cleaning recommendations according to hardness
Very Soft and Soft, service and cleaning recommended every 6 months.
Slightly and Moderately Hard, service and cleaning recommended every 4 months.
Hard and Very Hard, service and cleaning recommended at least every 2 months.
if it is well water, analyse and balance the water to achieve better performance.