I've been putting it in for a week now, and I STILL do not show any on my tests. I don't know the temp of my water - we don't have a thermometer right now - but it's pretty cool yet, so I don't know if that's affecting my results. I'm using Stabilizer from who knows when - the old owner left it here and it was left in the pool house all winter and summer last year. It could be even older than a year!!!!
My water LOOKS great though - but of course it's all brand new water from the city - which is good for this newbie pool owner and BBB trier!!!