WOW----WAIT. Everybody is ...

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WOW----WAIT. Everybody is shooting all they know about LSI and remin, but I don´t know if they read about the issue: Corroded tanks, but is it INSIDE only? why then you mention the saline environment? How about outside? is it OK? Is the lining looking good? Actually I am not clear from the writing if the tank holds seawater. I must assume not, AND that it is fit for the location.

Also you have not said HOW MUCH remin (ppm) is provided.  You are using ONE calcite filter? what about the others? working? not needed? ACID: You dose how much? what about the alkalinity destruction?

Suggestion: Try to get some CO2 if you can. Possibly you cannot, so, my gut feeling is that the ration acid/calcite is not good. Reduce calcite and check pH avoiding acid if possible. I disagree that you should shoot as high as 9. At 8.3-8.5 it could be your solution. Let us talk disinfection afterwards

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Hi Miguel.

Thanks for your help.

We have had a representative from the tank company, but obviously they would lay blame on another entity or product as to the cause. The tanks in question indeed hold potable water, not sea water. The 160mm outlets on each tank has severe corrosion on the outside, and corrosion also is evident on almost the entire circumference on the bottom 33% of the tank. The liner had no tears as such, but for an unexplained reason has been compromised. How, we dont know. I have 2 calcite filters working on 1 RO unit , and this unit produces 15m3/hr, another produces 24m3/hr and another produces 36m3/hr, into concrete storage tanks 300,000 ltrs each, the flow rates from consumption is undetermined as of yet. With this unit running, the permeate in the 300,000 ltr storage tanks sit around high 8 to 9.10 pH. When not in use, the permeate sits around 7.9 pH. I add acid to control pH to 7-7.2

Alkalinity isnt measured due to reasons unknown to me but i am making my best efforts to have this entire situation rectified, in the best interests of the public.

I am concerned about the quality of the water,more so from a consumption point of view, but also to clarify our corrosion issues,  if post RO there is no remineralisation. Testing was very minimal until i arrived here

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Chris, I believe you are on the right road, especially with your concern about quality. The comment of Steward Shipard should be taken seriously. I believe that as soon as you get some alkalinity reading you will have an important part of the puzzle. You have not commented if you have CO2 available. Life is easier operating mild acids such as carbonic acid. Whish you could.

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