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the way i look at it, for a 30gal tank doing a 5g water change a week it will take around 2 years ish to pay for itself... maybe later on in the hobby i will but not just yet
hehe - actually according to my calculations - it's 60 weeks.
$150 for a RO/DI
divided by .50 =
300 gallons worth of water for $150.
At a rate of 5g change a week, 300gallons gets you to about 60 weeks worth.
after that you'll only need to maintain the RO/DI...
Although I did not factor in the cost of water from your local utility. On the other hand $150 gets you the nicer model RODI with the switches and what not. At least that's what I got...(still have to go to mike's place to pick up).
If you go with our sponsor AWI (that's what I got -the typhoon rodi) - you'll have to sign up to be a member first. Definitely consider it! I think there are a lot of other folks with smaller tanks than you who think the membership is worth it...speak up people!!!
But I personally just go with the salt water from Trop. I go pick up my salt water put the heater in and I am good to go. Lazy arse obviously but effort for 5 gallons and my time at this point it is not worth it. If I get a 90-120 gallon tank like I hope to one of these years then I will make my own.