Inline alkaline drinking filter

[Sense of nature]

Anyone use one?
http://www.ebay.com/itm/Supreme-ALK...252420?hash=item2803408744:g:aAkAAOSwyQtVnzVW

I know it says drinking, but would thinks be stabil? like Kalk water dosing?

 

[bertoni]

It likely will be safe to use, but it's not going to help with anything. I'd stick with plain RO/DI or consider Kalk. Filters like that don't deliver enough calcium (or anything else) to be useful in a saltwater tank.