Before operating a portable tactical water purification system, field engineers must execute a precise staging sequence. First, the intake hose is submerged into the raw source with a protective screen attached. Next, operators backwash the multimedia sediment filter to clear accumulated particulates. Immediately following the backwash, water is routed to the high-pressure pump until operational pressure is established. Once pressure stabilizes, a chemical disinfectant is injected into the treated effluent. Finally, engineers verify residual chlorine levels before opening the main distribution valve to the storage bladders.
According to the passage, which step takes place immediately before water is routed to the high-pressure pump?
- ASubmerging the intake hose into the raw water source
- BInjecting chemical disinfectant into the treated effluent
- Backwashing the multimedia sediment filterCevap
- DOpening the main distribution valve to storage bladders
Cevap
Backwashing the multimedia sediment filter
The passage states that 'Immediately following the backwash, water is routed to the high-pressure pump.' Therefore, backwashing the multimedia sediment filter is the exact step executed directly before routing water into the pump.
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Anahtar Kavram
Identifying immediate precursor steps using explicit chronological signal phrases in procedural passages
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