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References in periodicals archive ?
1]) than in Kraavi and the Manganese Greensand filter is not able to reduce the iron content to the level of 0.
The Manganese Greensand filter is used in eight purification systems (Krabi 1, Kraavi, Vommorski, Parksepa, Puiga, Misso, Vastseliina, Kose).
The first tank contained a 3-ft depth of greensand filter medium, 0.
After passage of this ozonated water through the greensand filter, the permanganate was reduced, the precipitate removed and the true color reduced to 5 color units.
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