Waterlogged: but without closing one of subloops in parallel, won't most of flow go skipping resistive-lot-of-waterblocks-loop part, when one of pumps fails? In serial pump connection it has no way to skip, not so with parallel without closing some valve or pressing tubing in it to close it. So one three way ball valve, or 2x two way ball valves or something like this @bad business practices shop.
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