Try blowing through a pump; They're not a complete restriction, water can still flow through them when they're not running.
Watercooling loops have a high level of restriction; the pump will never reach its manufacturers max GPH in a loop, so adding another in series adds pressure and allows the pump to flow more.
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Hypocritical Signature I tried to delete: Procooling: where scientific principles are ignored because big corporations are immune to mistakes and oversights.
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