Review on Marineland PA0137 04 Rite Size Cartridge 4 Pack by Erin Hawkins

Filters are easy to change. Pretty cheap. They just work. My last pack of filters wasn't very good. It seems to me that there was a lot of carbon in the filters in each bag. So bad that the filters were clogged within a few days. I had to shake them under the kitchen sink so all the charcoal in the bags settled on the floor and the water could drain through the slots in the filter. After I did that, the water started flowing again. I repeated this process every few days until my next monthly shipment from Amazon arrived. I installed this new filter pack 2 days ago from Revain Autoship. So far the filters are working very well. Everything has returned to normal. Hope this helps someone. If it works please like it.