Most people aren't aware that in order to keep the warranty in effect, you need to have the unit serviced, acid-flushed and cleaned, every year.

I like to look at my body like a machine - if there's a constant flow of corrosive acid and the gears aren't turning nearly as often as they should, I, as a machine am not a very good one. 

If you have found nothing better to do with your life, then you're a loser.And tripped on acid every day for 18 months age 21-22.

Buying an acid right now is like trying to catch a falling knife you're going to get cut.

Roaches don't develop resistance to boric acid.

Then they stay put out of sight/mind away from kids or pets.There are some fairly safe dusts that are basically boric acid (Borax) and a sugar/flour mix.

Animal urine is a total pain to clean, and based off of my experience, if it is really bad, I want to let you know that I did several washings on the concrete with all sorts of different kinds of cleaners including muriatic acid.

That will be the acid test for them. 

If the copper makes you feel better then use it, plumbers in my area pipe their own houses in pex and only care for copper because they make more on material upcharge and labor to install.As a side note- acidic water breaks down copper, which ingesting can cause health issues, and can cause pinholes in copper piping.

Keep 2 plungers in the house, along with Liquid Fire or other acid drain opener.