Moderator comment: This post was separated out from this thread: Reaction between Aluminum and my Chlorinated pool water?
I'm experiencing a similar problem with water quality in a tank. Current specs of my set up are: 270,000 gallons, (960,000 litres), of chlorinated pool water. It's a large tank with a set built inside (for the film industry). There is a large set submerged inside the tank. It's mainly built out of aluminum, and plastic, and a bit of Fibreglass.
The walls of the set are painted and covered with a sealant. However, the aluminum coated with a sealant but, It's all boxed aluminum. The ends are open allowing for water to enter the inside of the tubing.
We are running 7 brand new Pentair cartridge filters, and 4 brand new Hayward sand filters. The water is heated to 89 degrees Fahrenheit.
We filled the pool with fire hydrant water, and it was clear when the pool was filled. Three days later the water turned quite murky. The pool is 12'8" deep, and it's a struggle to see submerged items on the bottom in normal light.
We have shocked the pool, and have tried many chemicals to clear the water. We've had the water tested at a local pool place that is a standard pool water test. The water came back normal.
The water still remains murky. Any ideas with the above mentioned?