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Little Sister & Big Sister Installation Tip

(Gravity Return Filters)

This filter typically requires servicing approximately every 10 to 14 days,
Uses 1/3 less electricity and therefore
Costs less to operate and less to purchase initially.

A general rule for gravity-fed plumbing: Remember water always seeks the path of least resistance

There should be a 1/4" drop (y) for every 1 ft. (x) of horizontal length.
x = horizontal distance from exit of filter to exit at waterfall.
y = minimum of 1/4" drop plus friction loss in pipe and fittings.
Number and type of fittings should be included in your calculations.
Proper pipe sizing for any given flow rate is required.