Product review (5 stars): RPS #1T is No. 1
This water treatment for evaporative humidifiers is wonderful.

I used it last year for my whole-house Sears humidifier.

One set of filters lasted all of the heating season here in Connecticut.

There was absolutely no scale build-up anywhere in the humidifier.

It was all trapped in the filters.

I'll be ordering all of my humidifier supplies from RPS from now on.

Thanks so much, RPS.