My pool is a five year old pebble-tech with several rust spots in various areas. Main cause of rust spots are the kids throwing various metal objects in pool (nail, nuts/bolts, etc.)
Aren't kids grand?
I have an IC40 SWG in use and currently the pool is crystal clear. I also use a newly installed Zodiac MX8 which so far has been kicking butt. (Doesn't interfere or get hung-up with the in-floor pop-ups)
I have been reading quite a bit about rust removal and it appears (if I'm understanding correctly) that using Oxalic Acid in a sock would have many advantages over Ascorbic Acid. The chief being that Oxalic breaks down into CO2 as opposed to an insoluble organic compound like Ascorbic. I've also read that Oxalic removes the rust better due to its enhanced iron absorption properties.
My tentative plan is to put the Oxalic acid (99% pure) into a sock and cover with a brick over the respective stains.
My question is this - Does this sound like a better idea than the Vitamin C in a sock?
I was thinking that I would stick with the Oxalic because I can pick up a 50 pound bag for around $80 bucks and that it would also be beneficial as a calcium reducer (hard water here in Phoenix) as well as a PH reducer.
Penny for your thoughts?