i have something called Blue Shield Mustard Algae Eliminator which is 60% Poly.... Ethylene Dichloride. is this the same as PolyQuat? Have BlueSheild Mineral Magnet for the sequestering agent.

What shoudl i use to clean the bare walls? Muric Acid? Diluted? Scrub brush? how long do i let it sit on the walls? Do i need to pump out the remaining water once it's got all that acid in it?

Also, wanted to mention my filter is a StaRite cartridge type witn one brand new set and one old set of filters. I was going too start with the old set and after the initial filtering, move to the newer set.

Also, that "metal filtering" sounds interesting. I tried your search suggestion but, it came up with too many non-related topics when i typed metal filtering (got everything with filter and/or metal in it). i tried "metal filtering" and nothing came up. What is the proper search strings to use? It seems Google's normal search pattern doesn't seem to work here?