Natural ChemistryPhosfree, 3-Liter

We had a green algae problem from middle of last year onward. I would get algae along the bottom of our walls even though my Free Chlorine, PH, and Alkalinity were all perfect. I would by some Green to Clean, which would get rid of it for a bit, but then it would come right back days later. Eventually, I just closed the pool last September and blamed it on something wrong with our DE filter.This year, our filter broke so we got a new one (DE again). Same freakin' problem with Algae. Spent another $100 on Green to Clean and Chlorine, and the algae was still coming back along the bottom edges first - and then up the walls and along the floor.After reading a ton of reviews everywhere, I bought 2 bottles of this product. The pool was a pretty bad color of green about now, but we tested and poured the right amount noted this in anyway. We tested in 48 hrs, and emptied/refilled the DE in our filter (no bumping, as that would release a lot of algae back into the pool). We kept doing this ~3 or 4 times over the week (test Phosphate, pour in recommended amt, cycle DE) and we are now back on track!It did cost me ~1 25lb bag of DE, some chlorine, and time scrubbing the pool to loosen up the algae, but it worked! The phosphate level is below 100 now, and the pool is crystal blue. I turned our pump down so it is only on 8hrs per day (energy savings), as well as not having to dump 2 lbs of shock in every few days in addition to my inline chlorine feeder - just to stay ahead of this!We only used up 1 3liter bottle getting our 27' round pool in shape, but we will definitely be checking weekly and using our 2nd bottle thru the summer, closing, and next year. Must have this stuff on hand at all times!NOTES:- If you have a DE filter, expect to cycle the DE at least every day until the pool gets clean.- Don't forget to stir. This is a milky white product, and we thought it was clear for the longest time because the white stuff was on the bottom.Thanks for all the reviews - a huge help!UPDATE AFTER USING FOR 2 MONTHS: STILL NO ALGAE!! This is amazing stuff! Buying some more now (1/2 price) to have on hand for next year. I agree with another reviewer - this is the best kept secret at any pool supply store. Even if you don't have an algae problem yet, you should still get this stuff because you don't want an algae problem.UPDATE AFTER POOL OPENING FOLLOWING YEAR: STILL AMAZING!! I put the rest of my 3 liter jug into the pool at the end of last year, and this year we opened our pool late (mid June), and there was still no algae. We measured the Phosphate levels again, and they were fine. We went right to a maintenance dosage this year. When we opened our pool late in prior years, the pool looked like a swamp. It used to have flies, frogs, and some other weird swimming creatures. We couldn't even see the bottom of the pool. Now, after using this - it is amazing. Will never go back, and I always have an extra 3 liter on hand now!

Although I test and maintain my chlorine and pH levels religiously, I began having yellow and black algae issues that kept getting worse. Being a novice pool owner I was unaware of the importance of low phosphates since my test kit didn't have that feature (most home test kits don't). Upon learning phosphates are fertilizer to algae through internet blogs I tried several products that lowered the phosphates when tested at my local pool supply but the problem persisted. I purchased Natural Chemistry's Phosfree and after one treatment the phosphate levels fell to nearly zero. Within a week the yellow algae was gone and the black algae went dormant. After brushing the walls of my pool there are still light gray stains from the black algae but that is permanent from what I'm told due to the porosity of the 25 year old plaster. For ongoing weekly maintenance I use another Natural Chemistry product Pool Perfect + Phosfree and haven't had any further issues. These products work and I'll remain a faithful customer.

Our pool is situated near a large apple tree and gets numerous leaves in it all summer. Along with pollen adding more debris, the Phosphate level in the water causes green algae to form quickly, and algaecide does nothing to alleviate the problem. Heavy shocking doesn't help either. Google told me the algae feeds on the phosphates and a Phosphate remover should help. Well, it did! From green growth all over the liner to crystal clear water with no visible algae on the walls within 2 days. A quick vacuuming to pick up the dead algae, and all is well. Great price, effective, and there's enough in the bottle to last a couple years in my 18 foot above ground pool. 5 stars!

I bought this phosphate remover a couple of times. Works as expected. Delivery is fast and packed safely. Price okay.

Great product, well packed, arrived undamaged. Must have for spring!

Works well to clear phosphate from pool water

Great product works great

What's great on controlling algae