Applied / spread ascorbic acid once first two months (of opening). Since then AA treatment almost every week due to brown / iron staining, and wondering what's going on as nothing significantly changed. I even took the pool light out, cleaned out the niche (was pretty dirty and this may be causing some mustard algae which is another story - if you are going to remove your light, please have your vacuum ready-to-go before dead / live algae spreads), and currently soaking screws in vinegar / AA to remove any rust.
FC 1.0 (will increase / go through SLAM then Mustard Algae treatment)
pH 7.0 (had to lower TA and aerating a bit)
CH 50 (but vinyl pool)
Not sure why iron staining is occurring so frequently...went through 10lb of AA this season already and looks like another 10lb until closing (mid-Sept??).
I did read on a TFP board that I should not increase FC dramatically once I go through AA treatment so I did so..in fact, was going through the process of slowly increasing FC but this occurred again.
Any insights? (oh...have Culator and poured in 2 qt of Jack's Magic Purple 2 weeks ago)