Clean water is not free. This mod adds three tiers of natural water processing recipes to Krastorio2. The processing requires water filters, which has similar mechanisms to air purifiers.
Love the mod, ran into a bug. Silica is turned into silicate powder in the crusher, to be used for purification powder. For some reason, crushers sometimes lose the recipe for silicate powder and switch to just destroying silica. Fixed by taking all silica out of the crusher, or by picking up the crusher and putting it back down.