Hello Nigel, the system has such a compact package and interesting that without a mechanism part, no electrical, control system-no backwash, may I know what system are you using?  this will be useful for poor people in our area. send me the information to tris.hardiyanto@gmail.com

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Hello Nigel, the system has such a compact package and interesting that without a mechanism part, no electrical, control system-no backwash, may I know what system are you using?  this will be useful for poor people in our area. send me the information to tris.hardiyanto@gmail.com