You speak as if you know this to be true. What’s your evidence? Vibes? Be honest

I have an APEC systems RO-90 in my parents home and an APEC RO-hi system in my house. They work fantastic and are easy to install. Brings me peace of mind knowing my drinking water is super clean

APEC doesn't appear to even be certified by NSF which is rather disconcerting.

https://info.nsf.org/Certified/dwtu/listings.asp

I went APEC too; can recommend, but I expect most of the look-alike systems to work equally well (filters being interchangeable).