Hi Dave
A bit bored today so I created a single web page calculator to do these
sums. You can enter various SG's and tank volumes.
You can save it to your computer and use as and when


I have put it here

http://www.site266082.fsnet.co.uk/

The password to get in is "saltsums" without the quotes. Its good for ten
days

If you can't get in and want it just ask and I will e-mail it to you


Regards
Grimeaper