I completely agree. I get roughly 3-4 months per 5# tank on average. I was having to fight hard to even bring my PH down to 7.5 (it's at 8 out of the tap). I leak tested the reg unit but I would not be surprised if there was a leak somewhere that I missed, I cannot discount that.
Either way it was hard to keep the CO2 in the water when I used the sump, the closed loop systems I have installed now are exponentially more efficient :-)
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70g Reef Tank :|: 56g Column Planted DP Tank :|: 40g Planted Community Tank :|: 8g Planted Nano
Fluval Pimp #41