TLDR version: This may be considered off-topic, but I'm wondering if brass fittings are safe for an air line to skimmer?
I've been using an airline to the outside for about a year now. Slight if any pH increase, but I like the idea of fresh air coming in. I certainly enjoy breathing it when I walk out the door after being inside for extended periods of time, hopefully the tank feels the same.
Recently upgraded skimmer, and decided to upgrade the air-line setup. I swapped out the DIY intake (pods jar carbon and polyfill) with this:
It is mounted to a roof vent in my attic, roughly 32' of hose length from the skimmer. The brass fittings would only be the 3/8" NPT on media canister connected to a 90 degree elbow to the PU hose. So it's far from the tanks moisture, but close to the outside air humidity (no direct contact with rain). Should I worry about copper coming in with the air?