reverse osmosis

[naesco]

I have a Spectapure RO/DI system manufactured in Arizona.
In looking to buy some replacement filters I happened to search the FAQ on their website.
I am not a technical person but the answer to the question of whether DI in needed in the Vancouver watershed was no because of low PH water.
Based on that FAQ I continue to use RO and have discontinued the DI.
IMO Spectapure manufactures the stuff so if they say no, I believe them.
Any comments?