AboutSteve Young Expertise I will answer questions on residential water treatment, i.e. use of softeners, filters, reverse osmosis systems, disinfection, iron and/or sediment removal and other issues facing the homeowner.
Experience I have worked in the water treatment area for 15 years. I have specialized in the design of reverse osmosis, deionization, and water softening units. I have also done work in water quality and stream and river remediation as it relates to the Clean Water Act.
Organizations I am currently serving as an Expert for Home Improvement, Travel (New Mexico) and Travel (North Carolina)
Expert: Steve Young Date: 7/11/2008 Subject: Muriatic Acid System
Question Hello Steve
I finally got the pH to drop but it took 4 gallons of water to 3 oz. of muriatic acid to drop from 8.2 to 7.8 and the 4 gallons were distilled bottle water. The water company that installed this said to only add 1/2 more to the mix and it should drop to around 7.2 . Unfortoanlly for me they have no idea what they are doing. I am at 4 gallons of water to 4 oz. of acid and still around 7.8, 7.7 they are tell me that this happening because my TDS are to high ( 410 ) and I need more acid to break through it. I am still running the system with a high 8 ppm of free chlorine and a total chlorine of 5 pmm at a pH of 7.8 anything lower the sulfur comes back. Is there any truth to what they are telling me and do you have any suggestions or insight into this.
Answer Hi Dan,
I don't know about the high TDS causing increased acid usage. To the extent that the TDS represents alkalinity it's true. What will cause increased acid usage is high alkalinity. Do you have any tests to indicate what your total alkalinity is? That would be very helpful. The higher the alkalinity the more acid it will take to lower the pH. The reason is this:
HCl (muriatic acid) + CaCO3 (Calcium carbonate alkalinity) -----> H2CO3 + CaCl The H2CO3 is carbonic acid and thus lowers the pH. But it won't lower the pH until all of the CaCO3 has been reacted with.
Let me know what you find out.
Take care,
Steve
