I am doing this process on a vinyl liner pool, my neighbors pool. Would you recommend the same process? Looks like Amazon is out of the HDEP stuff for a couple of weeks. Found it at Sears online for twice the price. Also found a 5 pound bag of Asorbic acid for $35 at a different website.


Like to use Amazon going through this site to help you out when I can.

You can see where I performed the Vitamin C test on the stairs at their pool in post #17 of this thread.
http://www.poolforum.com/pf2/showthr...hallenge/page2

My pool is concrete and has stains but the Vitamin C test did not clear the stains. Not sure what they are, they were there when I bought the place 9 months ago.