Ginfreely go roof top water tank wash her hai...

It is mainly due to our our underground pipes. Once upon a time, we had water rationing and air got into these pipes and they start to corrode.

The sludge in the water tank is also accumulated from underground pipe burst and repairs, and building owners did not do regular watertank flushing.
 
Just a bit of harmless sludge absolutely nothing to worry about.
 
Sinkies drink this mix with chlorine everyday ah! Iq become 90 in one year!
 
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