"this is a great product. I use this every week after cleaning 36 gallon tank w/ aqueon gravel cleaner taking out 25% of water. When filling back up I add a cap full of clarifier and a cap full of water conditioner. Every 2-3 weeks I add a new aqueon filter , says every month, but I find I need a new one twice a month :(
Water is like new. I love having a clear tank. I would recommend also for in between cleanings."
