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Ok so a softener is one of the most common home water treatment solutions around. I have never lived in a home for more than a year without one. They are not terribly expensive nor as hard to install as they seem. My current one is next to the well tank, also hardness is hard on water heaters so that is another pro. I love my rebadged fleck (iron brigade)
I have, and think on any well would, a cartridge filter. This is what I have https://www.amazon.com/dp/B06VYH4BK4?ref=ppx_pop_mob_ap_share but anything similar should work. I change it about every 6 months but it varries. I have it before the softener to to protect the softener from any sediment.
Ph is going to depend on if it is high or low, and you should see what the softener does first. Ph is the one thing I'd actually test at home, test strips are not too bad.
Also keep im mind water changes throughout the year.
Our house is around the same size as yours (5 Bed/4 Bath) and we have the same layout you describe (Tankless water heater, water softener and humidifier).
Like you, we are also on city water, but decided to get a whole house water filter anyway.
Very happy we did so, turns out our city water is highly chlorinated and has a ton of iron. The filter makes the water taste much better.
As one of the other posters mentioned, this will filter out helpful minerals also, so something to be cognizant of.
I love our tankless heater. Unlimited hot water. I would not go back to a regular tank.
Agree with the other poster that you should think about a hot water recirculation system.
This will give you hot water within a couple of seconds in your showers and sinks.
Be careful though... If you connect a recirculation pump directly to the tankless heater you may void the warranty on your tankless heater.
With our situation, we had to buy a small 7 gallon mini-tank, and then hook the recirculation pump to the 7 gallon tank.
As for maintenance, every year we descale your humidifier and I've been told that I should descale the tankless ever year but I've been too lazy to do it yet.
For the small 7 gallon mini-tank, we have to replace the sacrificial anode rod about every 3 years.
We are supposed to replace the filter in the whole house filter every 6 months but we do it every 3 months due to how much iron and chlorine is in our city water.
Best of luck to you.
Sure, this is the one I use, and I have two back to back so that I can stage the filtration:
Here's another variation via amazon:
There are many more that are even more advanced, but are more expensive. I recommend installing shut-off valves on both ends of the whatever system you get so that you can more easily change the filters (by turning off the pressure on BOTH sides prior to filter removal, that way any water in your house won't flow back).
One thing is that you'll need to know what size pipe you have where you want to install. Install is fairly easy. If you have copper pipes, cut with a copper pipe cutting tool, sand, and I used shark bite fittings. PVC is similar but make sure you get fittings appropriate for the type of pipes you have. Reply or PM me if you have more questions!
looks like this one, or one that uses 'universal' ten inch filters: