1. RO/DI unit pays for itself
2. You can find a used setup for south of $50
3. You can explain that you'll never have to buy drinking water again!*
4. Show pictures of the sludge the prefilters catch to naysayers
5. Don't EVER use tap water, you'll regret it without even knowing
6. RO/DI unit pays for itself, it's like the Flowbee (snicker)
7. No, seriously, RO/DI unit pays for itself
8. You can always resell it if all fails
9. Makes great ice
10. RO/DI unit pays for itself*
*just make sure you bypass the DI when making drinking water.
I bought my RO/DI unit for $35 used, then bought new filters, membrane, upgraded GPH to 100 & once I showed my wife (& everyone who comes over) the prefilter, there are no arguments. I used to be an avid tap water drinker/tank topperoffer.