PoolRx+ Booster Blue Swimming Pool Algaecide - 4 Pack (332004) | Prevents Algae Growth | Ideal for In-Ground & Above-Ground Pools, Spas, and Hot Tubs

This is an amazing product, I wish I only would have found it 20 years ago. These refills do not come with the copper metal inside them but if you buy one of the original baskets you can take the copper out and leave it in your Leaf catching basket on top of the open container. My pool went all summer without the filter needing to be cleaned and without any green or black at all. The spring prior to the summer also has no green or black at all but I plan to change the container and clean the filter four times a year anyways.