I made mine from Bobby m's design and it works awesome. I myself feel like I need a pump for my chiller but some guys don't use them that's up to u and your research on weather or not u need a pump. If u are planing on expanding then yeah get a pump u will need one later. But if u don't foresee using a pump for anything other then a cfc look into doing it without a pump. ChoppsKmcogar said:No, I don't have a pump. And he said its homemade by from Bobby's design. Whatever that means. Will I need a pump?