Swimming Pools in France

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Increasing Chemical Hardness.

Advice please.

I have a 50,000 litre, liner, swimming pool, installed in 2008.  To check the water balance I have progressed from the Acucheck trutest to the Scuba + and now the LaMotte Colour Q 7 plus.  Throughout Chlorine and Ph have been within normal parameters and the water has been clear with no signs of other problems.  Despite this I have, recently, become obsessed with Alkalinity and Calcium Hardness.  In May the Alkalinity reading was 77ppm I now have it up to 87ppm.  The Calcium Hardness readings are as follows date and ppm.:

16/05/2016

56

06/06/2016

21

09/06/2016

56

11/06/2016

53

12/06/2016

54

12/06/2016

74

13/06/2016

117

15/06/2016

92

18/06/2016

87

18/06/2016

107

20/06/2016

113

21/06/2016

81

 

Throughout this period I have added 12 Kg of TH+ obtained from three different local pool shops so I estimate that Calcium Hardness should have increased by up to 160 ppm.  I have checked our tap water 99 ppm and rainwater from the water but 30 ppm.

 

Any suggestions very gratefully received.

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Re: Increasing Chemical Hardness.

I suggest you ignore the information you are reading. With a vinyl pool hardness is of little interest. Alkalinity likewise, if you increase your alkalinity your pH will begin to creap up too and then you'll spend more money and more time buying acid to bring it back down again. Most published information assumes you have a concrete,tiled or plaster finished pool where hardness and alkalinity are of paramount interest. I run my pool with alkalinity at around 40ppm and I had very hard water that I have now bought under control.

Passivpool Energy "A++" rated Swimming Pools, the lowest running costs in the Universe.
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Re: Increasing Chemical Hardness.

Thank you.

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