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This could be a big advantage to soft wash roof cleaners. This information was taken off of Powell manufacturing website.

High Strength Low Salt S H Continuous Production System

Produce up to 30 wt.% S H (bleach) containing only 8.5 wt.% salt.

With the reduction in salt content and with reduced levels of S chlorate and S perchlorates achieved using the patented technology, diluted High Strength Low Salt (HSLS) Hypo is a high quality product that is more stable, has a significantly extended shelf life, and is 4% lighter in weight in comparison to standard S H (13 wt.% containing 10.4 wt.% salt).

The high strength, low salt S H production process is a unique two stage process consisting of the chlorination stage and the salt removal stage. The plant is completely automatic and requires only that someone be available if a process upset occurs. The system has an adjustable production rate and is able to produce strengths up to 385 grams per liter available chlorine. Systems are completely skid mounted on structural steel frames. The dimensions for a system that could convert 25 STPD of chlorine to 30 wt.% Hypo would be approximately 40' long x 40' wide x 20' high.