I have been on the struggle bus with my pool for the last two months. My local pool store kept telling me to shock the pool. I did, it would work for about three days and the yellow algae came back. It looked like strips of sand at the bottom of the pool.I bought this product and in two days (did I two days in a row to really kill it) I have my beautiful pool back!The price was very fair and the results were fantastic. I highly recommend this product. Bravo.

Apparently Amazon wont let us reply to a reviews anymore ... but at any rate. The guy above talks about adding Sodium Bromide in chlorine pools. Well yes, this product will convert your chlorine to bromine, which is less stable (and as a consequence "eat up your chlorine"). However! the reason we are doing this is bc yellow algae is resistant to chlorine, which is why you're buying the product in the first place (le-duh). Second, the guy above (while correctly noting that bromine is less stable) also claims that he had to drain his pool bc he could never get it stable again?? Well if Bromine is less stable (and it is), meaning the sun is going to burn it off in less than a day (and it will), then would that be his first clue that it wasn't this product which caused his problems (le-duh). (I'll about guarantee that guy had Chlor-lock from all the tablets he was adding in. Don't take pool advice from someone who uses that many tablets).I hope that sets the record straight. I stand by this product, assuming you have half a clue RE pool chemistry. A couple of tips about pool care to realize when reading the product's instructions. (1) You should use this product after shocking your pool, which you should only be doing at night in the first place. To put in more clearly - USE THIS PRODUCT AFTER THE SUN GOES DOWN. (2) Follow all other instructions on the bottle (i.e. sweeping before and vacuuming up waste after). (3) BE PREPARED TO ADD MORE CHLORINE THE NEXT DAY (and no I don't mean the tablets!!!). After using this product, you will need to add more shock (i.e. chlorine the following morning/evening. Personally, I add in about 1/2 my normal shock treatment the next morning (before the SUN is hitting the pool) while I am vacuuming up the dead algae and then do another 1/2 or full shock treatment that same evening depending on my FC levels.

The person who does my pool recommended this product. When the pool is a little cloudy, such as after a big rain storm, I use a little of this in conjunction with pool shock. The pool clears right up.

Gets rid of mustard algae

First off, beats Yellow Out not only in cost but also in effectiveness. Not only does it cost less, but you'll use a lot less. Oh and for the record, I wouldn't wish this situation on anyone except my ex.So my story began in the middle of May after the pool had been open for two months, gotta love the south. I visited my local pool store to tell them that my deep end was green (photo #1) and I couldn't see the bottom.....and so the nightmare begins. The associate told me that the water was balanced and all I needed to do was "Shock the heck out of it". That's $300 of awful advice. See picture #2 to see what the result is after shocking the heck out of yellow (mustard) algae.Return to pool store and got my guy. I showed him pictures and he let out a slow breath and said I had mustard algae and that it is resistant to chlorine so shocking it obviously did nothing. Obviously, thanks for that....another couple 100 dollars later and he issues Yellow Out with a set of directions. The nightmare continues. Treated it that night and the next day I see stuff on the bottom and it kind of changed color (picture #3) but still not quite there. I was told to continue brushing the entire pool to the main drain and if my arms and back weren't hurting I needed to brush again.Finally I was seeing progress after a WEEK of brushing (picture #4). The water was clearing and I was feeling good about my success. Not so fast!We of course had to leave town for beach vacay (I know first world problems) and while we were away I slowly watched my pool turn green on the Ring camera. Each day worse and worse. Now I'm crying. Turns out the pump quit on day two and my robot vacuum was just sitting in a mass of green spreading the blossoms through the top fan to the entire pool (Bring back photo #2).Order new pump, week delay, no pump=no circulation. That week sucked.Ordered more Yellow Out and repeated the process after installing the new pump. See photos 1-4 again. Got the water clear, broke my back scrubbing and of course the blooms came back in the SAME spot. Now I'm crying, sweating and about to give up. I've watched every YouTube video and read everything I could. What was I doing wrong???????So I noticed that Amazon "recommended for you" included Yellow Treat (mind blown even Amazon knew Yellow Out wasn't working) and it had a different chemical...what did I have to lose at this point. Oh and I highly recommend if something touched your water throw it away, if you can't throw it away, ie. robot vacuum, bleach the crap out of it. Bleach is different than chlorine FYI.Yellow Treat arrives, only needed three capfuls and super shock. Next day it looked like shock laying at the bottom of the pool (Photos #5&6), so instead of brushing I went straight hand vacuum to waste. That's right manually vacuuming the pool. UGH! Which means a lot of refilling the pool.Water is clear and more white stuff at the bottom next day. This was repeated through the week with less and less white showing only I wasn't going to come up short this time. Three more capfuls, a touch more shock, manually vacuum and boom, DONE!!! Water is blue and the robot is back in the pool doing its job(photo #7). Reminder, started in May and here we sit on July 25, finally achieving success. I will maintain it with No Mor Problems and continue my regular routine.This situation cost so much money. More than 2 grand if you include the new pump. I'm a Yellow Treat gal from this day forth, although hoping I'll never need it again.To all of you suffering from the same problem, good luck and stick with it. This freaking algae sucks!!!