Tap water?

[bluesox68]

I know its not good because because of the extra stuff in it but I'm spending $20 a month on rodi and now. I figure if I tested my tap water and don't have any phosphates could this be a short turn soultion until I can find a used rodi unit? Also my inlaws have a softener so if I tested their water would this be a even better option?

Thanks