Water flows down the sieve to separate sewage and waste water from small. When passed to pass down into the floor around the tank sueng in the middle of the cylinder to separate the sediment. A film of grease and water stains, SOAP, out to make more damage to pass to the next tank clean and within a second tank contains the trap rock's small stains, which stone will stain and trap when entering into the third tank to contain sand, which will serve as a filter for small stains, which are a type of sand filters to sewage, and inside the tank next to serves with charcoal dutklin from water.
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