I think I may have encountered my first issue with a reagent. I noticed when I opened the DPD powder today that it was darker than normal. It is normally lighter/whiter and today it seemed dark and purple. I tried using it but it never really turned the water pink properly and thus was a challenge to get it to turn back to clear. Anyway, I was just wondering if I was off base with my hunch? I went ahead and purchased some more DPD powder and 871 just in case through TFPTestKits. Probably won't be here until next week so until then I am just keeping my SWG at full blast just in case but there is no indication at all of any algae issues. It's just a precaution on my side.