Question About Different Types Of Filters.

Ok, it's late I no but I'm hooked on looking at wfp stuff for when I get on my toes....

I'm just wondering, how come some companies who make wfp systems they have like a big long tube on them, is that something to do with the reverse osmosis filter? Because it looks a lot longer than the usual RO filters I've been looking at.

Question no.2

How come some companies who make the wfp systems use aswell as the RO system and the big long tube which I have no idea what it is....x2 di vessels? How come they use 2 of these and some companies have only 1 on there units?

What's the big white tube?

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It's a 40/40 system. Create water faster.

Just got mine, it filters more than 4litres a minute

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Damo has a 40/40 got a filter in it or is it filled with resin or crystals.

Also is 40/40 good for hard water areas as well as soft.

I know people uses then for them been quick at producing water.

So what is the 40/40 filter actually do, and also why do people use x2 resin tanks?