Recent content by hdjii

chem geek Although my education is a great help in understanding the terminology and following the discussions in this forum, the solutions to the problems encountered in caring for a pool only emerge from the intelligent analysis of the actual practical experiences of those who maintain pools...

Brushpup Whink is an aqueous solution of HF which is 1.5 to 3.5% concentration per the MSDS. I have used it for many years to remove rust from clothing, tile, aluminum, sinks, tubs, etc. It is very effective. The fluoride ion has a very strong affinity for iron, but HF is a very weak acid so I...

chemgeek: Thanks for the tip on the source for hydrogen peroxide. Also, I appreciate the cautions you have provided. As a PhD inorganic chemist, I am comfortable with the handling of hazardous chemicals when it seems appropriate to me. For example, I use HF sometimes for spot removal of rust...

smallpooldad: Thanks again for your input. From the 2012 Manatee Co. Water Quality Report: "Drinking water for the customers of Manatee County Utilities Department is a blend of purified groundwater and purified surface water. In 2012, an average of 13.66 million gallons per day of deep...

smallpooldad: Thanks for your prompt reply. I have provided answers below each question: 1. Chlorine is added daily as needed using liquid chlorine (aqueous HOCl, nominally 10.5%). Pump is 1 HP 3450 rpm. Filter is 75sq. ft. cartridge. The water normally stays crystal clear. The best indicator...

I have been following this thread and the others related to the removal of stains on pool surfaces as I am working on this problem in my 10K gallon pool. When I purchased my home two years ago, I found the 14 year old pool had dark brown stains on the sides of the pool with lighter stains on...