Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs.

Worked great to get yellow/orange coloring & lingering algae cleaned out of 16’ pool within a couple days. Used it twice to ensure sanitation of water but pool stayed clear for remainder of swim season! Definitely will be using for any future color/algae issues!

This stuff works! I sorta followed the directions....definitely make sure your alkalinity & PH are where they need to be.... now I shocked my pool the night before, but the directions say add yellow then shock. It still works when I did it backwards....so I guess this stuff basically super charges the chlorine or something because 12hrs later my chlorine levels where super low, which explains why you shock it again.... 12hrs after that chlorine levels drop again, which is why the the directions tell you to shock again! Bottom line is we had a bad mustard algae problem we were fighting for weeks....this stuff cleared up the pool in 12hrs! Buy it, use it, you won't regret it

Easy to use, just follow the package instructions. Absolutely no algae 24 hours after application.

Easy to install

works wellgood price

I had some mustard/ yellow spots on the side of my poolSo bought some Yellow Out which claims this gets rid of this. I followed the directions precisely. It did not work. Very disappointing

This was purchased as a remedy for yellow-mustard algae in my fish and plant-free water-fall pond/water feature. The label isn't specific on how it works but after a little research, I found that it's imperative that you follow the water chemistry relative to pH for it to work at its best.I inadvertently over-estimated my actual water volume of 450 gallons to be 800 gallons but dosed it at 1000 gallons. (a desired 25% increase I always add when using an oxidizer/sanitizer disinfectant type chemical). Thankfully, there was no obvious (immediate?) damage to the pump or piping. I don't recommend others to purposefully overdose by this >100% mistake.Despite the high dose (unknown at the time), I also followed up with the instructed amount of chlorine. I applied everything after sunset and brushed down all accessible rock surfaces immediately after adding the chlorine portion, simulating the actions one would take with a swimming pool. Chlorine was dosed as instructed during the day intervals as well. The chlorine used a CYA build-up of around 50 ppm for longevity purposes against UV breakdown.The treatment was repeated the second night, using the same or even slightly higher dose (remember, I wasn't aware at the time that I was significantly overdosing) with chlorine follow-up.There were no measurable differences in the sand-like streaks of algae spores (?) that tend to settle on the top pond overflow edge.Usually, I add the chemicals to the lower pond for mixing and distribution purposes. I've tried adding the product just on the sand streaks at the top pond and then adding the chlorine 5 minutes later. It would "react" with foaming action like an acid was eating something, but in the long run, it was merely a show of intent without actual results.If this product fails to work at essentially double the dose, how can you expect it work at half that much - a standard dose?Granted, this isn't a swimming pool with level, curved walls and bottoms but even a pool wall and floor is porous. It just doesn't have the large rock/boulder gaps, creases or pockmark craters below the waterline, or multiple liners that can trap debris. Still, a yellow mustard algae remedy is either a remedy or it isn't. If you don't see the result promised after following directions, it's time to move to plan B, C,...

Perfect for summer cleaning