Robin Gordon wrote:
thinking of gettting one of these whats the problems. do they need a pump
on all the time like the old ones used to

Only if you have low water pressure. "on all the time" is a
bit of an odd one, unless you were making water "all of the
time".

and are they good enough to plumb
into the standard water supply

Depends on your definition of "standard".

Given the level of your questions, we can't possibly know
enough about your situation to help you much, or as easily
as your friendly local provider.

Try the yellow pages, under water treatment. Sears, in the
US, used to do water filtration, as I recall. They already
know your local issues and can recommend a suitable system.

You can, then, choose to buy something from them, or take
the info and look elsewhere.