i bought the semi auto kit about 6 months ago. the only thing in that kit that i still use is the regulator/solenoid/needle valve assembly and the timer. the glass diffuser is very fragile and the guys that work at ups or fedex are usually not concerned with handling packages carefully. they sort them, tossing them onto conveyor belts and stacking them and so forth. anyway, my glass diffuser arrived broken, but i superglued it back together. it worked for a while. the bubble counter is...junk. pressure from the diffuser builds up in the line causing it to leak. i couldnt get it to stop so i eliminated it and just dipped the line in the tank water to set the bubble count.
the regulator in the kit is a decent one. however there are many other options out there. i would search around the net. i use a dazs glass spiro bubble counter now. it is an ada clone that looks awesome and is cheap, and it cannot leak because it is made of 100% glass.
it all depends on what size co2 tank you get. i use a 20 lb tank because that is what was available to me. they can probably last a year and a half - two years or longer. dont buy a bottle on the net. check what is locally available. look in the yellow pages and call places. if all fails you can go to any liquor store that rents kegs. they should also rent 20lb co2 tanks, but bear in mind that you will need to place a deposit on any tank that you rent from anywhere.
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