Looking at a 10 year old clearwell that has been exposed to an aggressive water with a Langlier Index of -1.3, Alk of 76 (mg/l as CaCO3), Hardness of 160(mg/l as CaCO3), and CO2 of about 50 mg/l. After 10 years the cement paste has been "dissolved" to about 1/4" in depth and only the sand remains. Has anyone seen this before and remedied the problem??
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