Treatments: Brain ache :(

[chris_reboot]

Just about getting the concepts of water treatment, but need some help please!
My water is very soft (25 Ca) and I have been advised therefore the only water treatment I need is DLS (i.e. no CRS)
My questions are:

A) is that correct?

B) I read that a bitter profile wants about 150 Ca, so I need to add 125, which is about 0.7g per litre of DLS according to Brupak's site(?)

C) what is in DLS, and do I need to worry about other chemicals like Mg? IS DLS alone all I need (see A))

D) should I be measuring pH as well as a double check? I dont have any kit for that at the minute - what's best, salifert?

Thanks from a brain-aching brewer!

[chris_reboot]

thanks Chris, I'm on the right road then!

[WishboneBrewery]

So far using the GW Water calc http://www.jimsbeerkit.co.uk/water/water.html and separate treatments my Mash pH's have been pretty much on target, all you need is a good water report with the CaCO3 etc and you can pick and choose your volume and Beer styles.