Man, just get the regulators that come with the chloramine filter kits from thefilterguys.biz.
They sent me a 40 GPD, a 60 GPD, and I can order an 80 GPD. The little poly line slips right into the end of them, I can change them out with one hand and they never leak.
They're not adjustable, but they're so fast to change, who cares. get a selection of them and you can choose how much per day to drip.
I drip 60 GPD in a 540 gallon tank.
They sent me a 40 GPD, a 60 GPD, and I can order an 80 GPD. The little poly line slips right into the end of them, I can change them out with one hand and they never leak.
They're not adjustable, but they're so fast to change, who cares. get a selection of them and you can choose how much per day to drip.
I drip 60 GPD in a 540 gallon tank.