I'd check the TDS
on it (maybe your LFS
will do that for you). If it is only RO
(and doesn't have a DI
stage) then you don't know what's left after the RO
. You may still have PO4
in there. You may even still want to run those test on your tap just to rule it out prior to using it.
Great that they have to come and service it for you. Bummer about the water though!
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