We've been using this Algaecide for the last 3 years with excellent results. 1 gallon treats our 20'x40'' pool on a heavily wooded lot, where we battle with leaves daily. The case contains 2 gallons which is all we need each season, for opening and through the entire summer.

This is the only algacide that keeps my pool algae free in the long, hot Arizona summer. The dosage amounts are very small compared to box store and pool store algaecides. The two gallons last me a year with just a small weekly dose we have crystal clear water.

This product is the best deal for your money. It is very concentrated and works great. Another name brand product at the same price point needs one gallon for an initial dose (for my size pool!) I only need 16 oz of the Member's Mark product to start and 4 oz a week if I need it for a booster. At first glance, one would think it is expensive, but after you realize you only need 1/8 the product, it is well worth it! It wirks great and keeps my pool free of algea growth.

Great product at a great price! Members Mark Algaecide 40 has the same chemicals in it as Wet and Forget but at a 40% concentration instead of Wet and Forget's 10%. I have used it on1/2 mile of white poly horse fence for the past three years and it works great at about 10% of the cost of wet and forget. I mix it 6 oz/ gallon of water and add 1 oz/ gallon of fabuloso as a wetting agent.

Sam's club products are the best and Sam's makes it so easy to shop on line instead of waiting on lines in the store

This is the only algaecide I use since trying it years ago. It is concentrated so it requires far less in the pool to get the job done.

It got rid of the green and blue algae which is really all I wanted. I am surprised that I'm still getting a lot of foam when the fountain is running. I believe I diluted it to their specs.

Works pretty good, as good as anything I have purchased for preventing algae, and you get a lot of product for the price. In my experience you need to add it more than weekly, I use the weekly dose about 3x a week. If your pool gets green its not real good at killing the bloom, but of you shock it good to get rid of the bloom, it will help keep it under control.

This is the first time I tried this product. I had algae in my pool and now it's under control with Members Mark product.

Removed algae from walls still fighting algae on pool floor; product causes foam not terrible but does not go away