Have been reading the posts on here for a while. Just signed up so I could help out. First post ... I have the Hydrofarm CO@ Regulator/timer and a 20lbs tank. I have not seen anyone post this yet, but from my learnings, you turn the gas on for 15 min every hour when light is on. Reg. set at 1500ppm. However, the tank only lasts approx. 7 days. Around here you get a re-fill for $20-$25. If you average 3 months for a complete harvest from seed to end, you will need 12 - 13 re-fills (that math is taking only having lights on 12 hours) = $286.00 minimum for co2 from a 2o lbs tank. for one harvest not including the purchasing of the meter and tank.

The Boost Bucket says it will last for approx. 90 days with a timer. Costs $125.00 for bucket and timer.
$100/per grow thereafter

It is much cheaper. I plan on buying one as soon as I sell my regulator.

I am searching for some reviews on the Boost Bucket. Anyone who has used it or heard someone using it, would love to hear some results.