Application of geolite will reduce the brownish water coloration, even than if it does shows any effect than go for chaining at the same time apply bottom flow threw and than apply bloom booster or soil probiotics.
liming or Caso4 ,2H2o (depends on PH of water ) can sediment organic material that causes brownish black colour .
yellow-brown phytoplankton can cause brown hue colour so you need stock of this algea. (water temperature has an important role for grown of specific algea)
Daily application of raw sugar 20-25 kg, brewed overnight with some baker's yeast will gradually turn the colour back to normal: water exchange followed by dolomite application daily around 9 am will also help to turn the colour back to normal: If both these did not give better result (some time it happens) formalin 5 ppm dose may by 2 time application
with a gap of one day will change the water colour in a better way
Dr.P.E.Cheran
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