Shower Drain Issues

Hair going down the drain is inevitable and no solution will completely prevent it.

Some drains can be replaced from above while others cannot. Unless you are having a chronic problem with clogging due to hair, I think you are making more work for yourself than necessary. If you try to remove it and can't, or don't install the new one correctly you'll go from letting a bit of hair down the drain to a full-scale leak.

It's also not going to stop draining completely out of the blue; it will gradually start draining slower, so it's very unlikely that this will become an emergency one night. I'd just wait and see. If you have a problem, then you'll obviously need to unclog it, otherwise, enjoy your shower and don't worry too much!

There are a few ways you can improve the situation but there isn't a true fix.

1. Replace/fix your shower valve. The rises and drops in your water pressure due to flushing the toilet or night time (city water pressure rises due to low demand) is allowing minuscule amounts of pressure to seep past the valve, with large amounts of time in between this could be air.

2. Redo all you connections with new Teflon tape, since this came about with the new faucet you may have a connection that is allowing air to seep in and either allowing the heavier water out or just assisting in the former scenario.

3. Install a backflow prevention valve or check valve to prevent any backflow, it sounds odd since water to coming out but somewhere it's exchanging water with air and this can help prevent that.

4. I can find the product name, if someone knows it please edit or comment, but there is something similar to a vacuum relief valve that you can get. This would be the most outwardly visible solution however it should fix it. The item looks like a vacuum relief valve but works a bit differently; it's a valve that is 3-way valve that has a pass through, your main water flow, and a vent. The vent is open when there isn't any pressure, or very low, to allow any small pressure build ups after the shower to simply vent and it would close with pressure so it wouldn't spray water during your shower. This should be installed at the highest point of the water, right before your faucet should be fine, and pointed up as it should only vent air. After you shut your shower off this would open and allow you to drain the line, just lower the head/wand; now if you have any water leak past the valve it would have to fill the line before over flowing, a ball valve one wouldn't even overflow. The item is either sprung or is a weak ball check valve.