Hi Pat. I appreciate your knowledge and help. I will look into the manufacturer of the calcite and get an appropriate indication of what it contains. From a new operators point of view, who has only been operating full time in the industry for 4 years, i am controlling pH for disinfection. In your opinion is this correct ?. The 4 work sites i deliver to have back up chlorine dosing, however the island public do not have any form of backup/monitoring/vermin proofing and the infrastructure has seen better days. Hence this is my reason why i am controlling pH, corrosion in a steel tank is a distant second. I was instructed to have my 2x 300,000 ltr concrete storage tanks maintained at a chlorine ppm of 0.30ppm with the resultant pH hovering around high 8-9.10 was the highest i saw. I didnt like this so i immediately began to control pH with the view to keep it around 7-7.5.  No alkalinity is tested for. I believe there is much more testing i can do to confirm the water quality, but for reasons unknown to me i have been instructed not too.

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Hi Pat.

I appreciate your knowledge and help.

I will look into the manufacturer of the calcite and get an appropriate indication of what it contains.

From a new operators point of view, who has only been operating full time in the industry for 4 years, i am controlling pH for disinfection. In your opinion is this correct ?. The 4 work sites i deliver to have back up chlorine dosing, however the island public do not have any form of backup/monitoring/vermin proofing and the infrastructure has seen better days. Hence this is my reason why i am controlling pH, corrosion in a steel tank is a distant second. I was instructed to have my 2x 300,000 ltr concrete storage tanks maintained at a chlorine ppm of 0.30ppm with the resultant pH hovering around high 8-9.10 was the highest i saw. I didnt like this so i immediately began to control pH with the view to keep it around 7-7.5. 

No alkalinity is tested for. I believe there is much more testing i can do to confirm the water quality, but for reasons unknown to me i have been instructed not too.