Originally Posted by
LLigetfa
Ja, 50/50 is good. I think most AVCs regulate to about that. Topping up to that in the absence of a working AVC or snifter makes sense. DonL originally stated he runs his with 25% air which is not much drawdown and if neglected won't take long to waterlog. Supercharging was suggested but it comes with the risk of air blowing resin out of a softener. The odds might be small but increases with the number of power outages.
IKWYM about a bladderless tank continuing to push water until the pressure is nearly 0 if not supercharged. A bladder tank is nearly empty at the kick-in pressure and has very little in reserve. If a galvanized tank is supercharged to about the same as a bladder, it too would have little in reserve. Giving a bladderless tank a 20 PSI head on a 40/60 system would give you lots of reserve and more drawdown.
I often hear people say they want a bigger tank in case the power goes out, but usually they are considering a bladder tank. Bladder tanks don't have fussy AVCs to deal with and don't need topping up so they are good for displaced city folk like Zaza Gabor (Green Acres). I'm not a fan of those little 4 gallon tanks either.
I have a 32 gallon bladderless composite WellMate precipitation tank for iron treatment. It is hydropnuematic and supercharged to rival bladder tanks. Air is entrained with a micronizer that has be maintained and the tank has an AVC that is also a high maintenance item. Unlike a standard bladderless tank, disabling/neglecting the air injection and/or the AVC on it is not an option.