SPS and tap water?

[Ranchu50]

I live in Coquitlam, and I have been using tap water for the past 4 years, running it only through an old carbon filter.
Have been getting red turf algae and redness on sand.
I definitely do not overfeed.

Just bought a vertex ro/di so i've been slowly introducing ro/di water into my 65 gallon.

We'll see in a couple of months if this will solve the algae problem.

I am shocked how inefficient ro/di's are. Such a waste of water to make purified water!!