I installed the filter in a small pool of 4000 liters, and for the two months that I used it with blue beads containing silver instead of sand, the pool was always crystal clear, and the flow of the filter was always very good. For the two months that I used it, I had no problems at all. I also used the special attachment it has for chlorination with multi-tablets, and whenever I checked it, it indeed gradually released the tablet, and the water never turned green, nor did algae form in the pool, and the water was always clear. I recommend it without reservation, but in general, when choosing a filter, make sure it has the capacity to filter per hour approximately equal to the liters of the pool; otherwise, you won't get good results. That is, if you have, for example, a pool with 10,000 liters, then the filter should be able to filter about 10,000 liters/hour for optimal results.