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Chemistry
Hydrogen
Water
O levels
chemmadeasy
igcse
gcse
grade 9-10-11
hydrogen
water
hydrogenandwater
chemistrysubject
chapters
alllevels
gases
compounds
mixtures
elements
reactions
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Solar desalination
is polular and is easy and cheap.
harmful bacteria
Water is chlorinated to kill sometimes flouride salts are added to prevent tooth decay.