US Water Systems Synergy 9000 Installation Manual page 23

13. Once the fittings are installed and tight, push the 5/8" drain line on the barb and
secure it using a hose clamp. This tube should be attached to a sanitary drain. An
air gap fitting should be installed on the drain pipe where this tube will be connected
(check local codes). If this is being conveyed to a floor drain, sink or sump pump, be
sure to maintain a proper air gap. Typically, a 1" air gap is sufficient.
NOTE: Perform all plumbing according to local plumbing codes including the
drain. Use a 1/2" minimum pipe / tube size for the drain. Use a 3/4" drain line
for backwash flow rates that exceed 7 GPM or length that exceeds 20' (6m).
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