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If your concern is that the 12v battery will pump too much water then:
A timer switch is not really going to help (just cycle between too much and none at all).
A 6v battery will help.
Anything restricting the flow will help (valves, spray heads etc.).
Reversing polarity will help (how much depends on your impeller type).
If your concern is that the battery will drain too fast then:
A timer switch will help.
A new 6v battery with more amps will help.
Flow restriction will not help.
Reversing the polarity will not help.
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