Dumb question, if I take a water filter and put it right before the tap on the hot water side as well as the cold will the heat make the casing fail? It says on the casing it's rated to function at up to 38c but I assume it means the filter cartridge will come apart after this. My plan was to put carbon filters on both lines. It's uv treated lake water as the source.
It's been many years since I dealt with water systems.
If this is your own lake water UV treatment system?
If so, it will likely not reliably treat Giardia, Cryptosporidium, or a bunch of other parasites common to surface (lake, spring, or steam) waters. If you're looking install cartridge filters, the UV's efficacy on bacteria my be questionable too..
UV systems are proven effective for low-mineral content groundwaters for bacteria....not so much for cyst-producing parasites on surface waters.
Chlorination is not entirely effective for these organisms either, but can do so with extended contact time over bacterial disinfection.
Not sure what you're trying to accomplish with the filters, but I wouldn't drink any water in the house if I'm correct in my assessment......
That said, any filtration or treatment should serve the whole house. Not portions of it. In my many years, I never saw a filtration system dedicated to only the hot water side....
I grew up on a spring-fed house supplied by a 300-yard lead pipe for 22 years...I had to pull frogs, snakes, and dead mice from the spring house. As my Dad said, "it's clear and cold..." You can't see the little critters I worry about now, as they're all microscopic and have no color or odor.
I dealt with girl twins with chronic giardia infections many years ago...about 4 years old.
Came from their spring feeding the house. The tech at the lab said their water sample had "creepy crawlies that gave me the ebby-gebbies" when she poured it through the membrane filter...
One looked 4, the other 2+. The little one couldn't kick the giardia, and had a "failure to thrive" condition going on.
I'm not trying to tell you what to do. Only trying to give you the information you should know as you move forward.