Aquatic Plant Central - View Single Post - Fertilizer Dosing pump
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Old 01-04-2005, 09:18 PM   #7 (permalink)
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The way I see it.... the timer just keeps turning, one revolution per day, meaning that for 12 hours the plunger is being pulled up (sucking ferts into the syringe) and the following 12 hours it's pushed down (sending the ferts into the tank). You can adjust the amount the plunger moves up and down by sliding the position where the plunger is connected to the rotating bar, the closer to the center the less vertical movement per revolution. But unless the motor is strong enough you likely won't be able to adjust it far enough off center to use the entire length of the syringe, so you may be better using a larger syringe and adjusting it to only use a small part of it. This would be a lighter load on the motor.

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