Hydrotech SL948-10-5600 Residential Scaleless System - Manual (Page 6)

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NOTE: Waste connections or drain outlet shall be designed and constructed to provide for connection to the sanitary waste system
through an air-gap of 2 pipe diameters or 1 inch (22 mm) whichever is larger.
WARNING: Never insert drain line directly into a drain, sewer line, or trap. Always allow an air gap between the drain line and the
wastewater to prevent the possibility of sewage being back-siphoned into the conditioner.
Drain Line Connection