Dan, I was running DIY C02 for maybe 6 months. I liked it, it was fun, but I had to refill 1 of 3 two litter Coke bottles every week to keep it stable and high enough to grow plants well. Now, you can grow plant without that much but I tried to get my C02 as close to perfect as possible using DIY. I have a 29 gallon tank.

When I got tired of that I did my research and found that Rex Grigg builds and/or designs these pressurized C02 systems. He is reputable and stands behind his work and I think most everyone here and on many forums would agree. I had him design my system. I told him what 2 tanks and sizes and location (distance I would need to run a second hose to my 2nd tank. (I run two tanks off of one C02 tank). He gave me a list and what it would cost and told me how to hook it all up etc. He sell Quality items that stand up.
Now you can spend more... And you can spend less... But it seems most of the time any way,People who post on these great forums, who has had problems with their equipment, usually, it is because they had the cheaper items. Rex's choice of equipment is good quality stuff. I don't think he is making any money off his help, He just loves the hobby and enjoys helping others.

So I would suggest you give him a try if you need help. No... I'm not making anything off this advertisement. My system works great and I just like to share my experiences with others.

Joe