Break down CaCO3 into its constituents

[rww63]

Homework Statement

in order for a well to supply 4.5 million litres of drinking water per day, at a minimum total hardness of 60mg l-1 as Ca, calculate the daily throughput of the reverse osmosis plant assuming that 30% of the feed to the plant comes out as reject.

Homework Equations

a table provides the following info:
total hardness (as mgl-1 CaCO3) at feed is 660 but at permeate it is 4

The Attempt at a Solution

i suspect i must break down CaCO3 into its constituents however i can't remember how to do this. Iwould be very grateful for a pointer in the right direction.

 

[rww63]

guys I am only a newbie to both the sciences and this great website, I am not looking for an exact answer but just a clue of how to tackle this question. if any further questions is needed please reply, i really am going off my head trying to get over this mental block I am having.

 

[qspeechc]

Perhaps you should post this under the "Other Sciences" sub-forum, also under Homework & Coursework Questions