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must...

• be

• constructed

• using

• local

• labor.

• be

• constructed

• using

• locally

• available

• materials.

• use

• generic

• suppliers

• rather

• than

• specialized

• components.

• operate

• without

• electricity.

• minimize

• use

• of

• valves

• to

• reduce

• costs.

• be

• robust

• and

• resilient.

• be

• optimized

• for

• low-cost

• and

• high-performance.

Designs

must...

• use

• unit

• processes

• that

• are

• observable

• whenever

• possible

• (no

• sealed

• reactors).

• be

• possible

• to

• operate

• without

• doing

• math.

• use

• chemical

• dosages

• that

• are

• set

• directly.

• be

• maintainable

• by

• one

• person.

• have

• a

• direct-reading

• indicator

• of

• plant

• flow

• rate.

• have

• a

• chemical

• dosing

• control

• point

• close

• to

• flocculator.

• have

• no

• small

• parts

• that

• can

• be

• easily

• lost.

• have

• removable

• parts

• for

• inspection

• and

• maintenance.

• be

• enclosed

• in

• a

• building

• to

• provide

• protection

• from

• sun

• and

• rain.

• be

• sized

• so

• that

• all

• tanks

• are

• accessible

• by

• a

• human

• for

• inspection.

• include

• provisions

• so

• that

• the

• operator

• can

• receive

• appropriate

• feedback

• for

• every

• step

• of

• the

• treatment

• process