Pool RX 101067 Black Units Swimming-Pool-Algaecides (4 Pack), 20,000-30,000 Gallon

Hopefully it works as good as last year. If so it’s well worth the money.This is the second time I’ve used this. The first time it really helped to control the algae for about 2 months per container.

Was skeptical that such a small thing could really clean whole pool. Had an unusual amount of algae at beginning of pool season. Tried the typical algaecides with no luck. This cleared everything up in a couple days. Had to do some light brushing in a couple spots but prior to ordering brushing wasnt doing anything. A couple months later still no algae.

This product has cut my chemicals by a third for my Salt Water pool. Pool stays clear all the time, I use to have to add chemicals every 2-3 days now only add shock once a week due heavy summer rains once a week. Highly recommend this product.

I have used this product for years and every year I tell someone new and they tell someone new and I have at least 10 families using the product and love it! Such a great invention. I opened my pool on a Sunday, shocked it, vacuumed it and popped this gem in the filter. No need for any additional chemical checks (except for chlorine tabs of course). I will continue to spread the word!!!!!

So far the unit works great, I’ve used it for my pool for about 2 weeks! The water is sparkling clean!

Looks good Thank you!

One of the best discoveries I have made to minimize the chemical balance of my pool. Strongly recommend and would add that buying this in a 4-pack is the most economical way to go.

This product works period.... I've looked at these reviews and many others on other sites and this product prevents you from spending hundreds at pool stores and online for temporary products that kill algae so they hate this product. By using this product with very little chlorine pucks or other chlorine products your maintenance bill gets cut in half. And you can fire your pool guy (no offense to the pool guys out there). I love this product.I use in my pool and the spa size for My spa with just chlorine pucks