Should there be a check valve downstream from the pump?
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Can you clarify the purpose of this system? A few questions:
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Where is the water coming from?
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What is it being used for?
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Your diagram shows a step up in the middle, is that to suggest that the water source is below the destination?
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If this is collected rainwater that will be used to water plants, why does it need the pump and filter?
Potable water needs to meet much higher standards than water to wash dishes or water the garden.