Natural Chemistry 5221 Phos Free Pool Cleaner, 2-Liter

Pour it in the skimmer following the instruction label when your pool seems to keep turning green even after shocking. Remember to turn the valve off for pool cleaner if you have one or else the liquid will go into the pool rather than line your filter. Leave filter on continously for 48 hrs, remember to backwash after and then do once a week with the phos free maintenance product and you will have very little algea problems. This is the best deal I found and super fast shipping.

Works perfectly, great stuff! Perhaps a different formula than previously used?? It seems to be more red than brown than before, but still helped clear up the pool!

Great to use weekly but if you have a sudden outbreak of high Phosphorus you will need to get a Phosphorus remover to get down to acceptable level than use this product weekly to maintain low levels or zero levels of Phosphorus. It will not remove high levels of Phosphorus as take it from me you will be required to use other products first to get your pool recommended levels.I love the product for weekly maintenance and yes on Amazon its half the price than large box pool stores.

I haveba fiberglass pool and start of summer I end up with algae starting to develop on walls. This stuff knocks it out and good rest of the year.

We use this to stabilize our salt water pool. It keeps the pool from turning green

If you are using Pristine Blue in your hot tub or pool, this stuff is the absolute best way to get rid of that green tint. We love Pristine Blue products but always had problems with that green tint in the water even when the water was dialed in perfect. Turns out it's a common things and this stuff is the cure. It works almost immediately too.

Have purchased these many time. Excellent value. The price is great. Have been using this product for years. Keeps the pool crystal clear. Easy to use. Two capfuls in the return (inground pool) and you're set for 7 - 10 days. Would purchase again. Thank you.

This product seemed to help our pool tremendously. I’m very impressed. Works great!