I recently added "stain wipe - ascorbic acid alternative" to remove iron staining on our gunite pool. Worked like a charm, stains gone within the hour.
I tested the water with my TF-100 test kit prior to adding stain removal and tested again 24 hours later. The first test showed that I had 40ppm cyanauric acid. The test 24 hours later, I had no cyanauric acid. Does the stain wipe interfere with the test method or is there a reaction with the stain wipe? I'm not sure what the stain wipe actually is, there is nothing on the package that specifically says what I added to the pool.
I did this same treatment last winter. I did not test the stabilizer level after adding but the following spring, as I was starting to get the pool ready for summer, I had no stabilizer. I went into that winter with stabilizer and came out with zero. I looked up info on that and assumed it was some type of degradation of the the acid over the winter. Now that it appears that I lost the 40 ppm overnight, I'm curious as to what I might be seeing.
Also, am I going to regret not adding algacide to the pool before doing the stain treatment? The water temps are in the 40s, I was thinking that algae wouldn't be a problem and I could work my chlorine levels back up before I had an issue. I have a 2 year no SLAM required record (since replastering pool) that I may ruin.