I built this sump for my brother in law. He has a 125 gallon tank that keeps my african cichlids that I had in a 72 gallon tank that I sold. He always had a problem keeping the tank clean, then finally listened to me and allowed me to build this sump for him. It only cost maybe 20 bucks to build. The trays I bought at walmart for just $4.50 a piece(well I paid for 1 because the girl thought it was a set of 3, so would of cost $13.50 for just the trays. Then I went to Lowes and spent sometime there till I got the inlet I was looking for. Pieces of pvc for the inlet cost 5 bucks. The overflow hose was $20.00 bucks, and filter media i got off ebay, so dont remember how much it all(bio balls, carbon sheets, and filter floss)was. This sump cleaned the 125 gallon tank in 2 days. Crystal Clear water.