Hello P.

I bought stuff directly from its company (not Amazon). Slow and rude email responses, and what a diminishingly rude tone of speech over the call. It was super unprofessional. I'd probably get better service from McDonald's.
Avoid this company and install an RO filter. Or buy stuff and make sure you won't interact with them. So sad to see how this type of business can run like this. Maybe this business isn't serving great products after all. You can tell what's the inside look like from what the outside looks like (aka CS). It's all rotten, like fungi. And I got no business dealing with a fungi-like company, especially when it's supposed to serve clean water.