Otto Graf GmbH
Plastic Products
Tel. +49 7641 589-0
Fax +49 7641 589-50		 export@graf.info
www.graf-water.com		 Carl-Zeiss-Straße 2-6
DE-79331 Teningen, Germany

Water is precious!

Save up to 50% mains water with a GRAF package solution for rainwater harvesting.

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Rainwater Harvesting tanks underground
»All about rainwater harvesting»Lexicon

Backflow level

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Terms for B

Backfill material
Backflow level
Biological cleaning stage
Biological oxygen demand (BOD5)
Terms 1 to 4 from 4

Backflow level

Height below which special measures against backflow of rainwater and combined sewers have to be taken. The backflow level usually corresponds to street level.

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https://www.graf-water.com/rainwater-harvesting/all-about-rainwater-harvesting/lexicon/begriff/backflow-level.html

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