Whole-home water filtration sales

Selling whole-home water filtration systems to homeowners through Facebook ads that show the price upfront, with licensed plumbers doing the installs. The channel notes that this model can require a plumbing license, for example in North Carolina.

Source
Parker J. Smith on The Koerner Office with Chris Koerner, “The Most Overlooked $81K/Month Business Anyone Can Start”, September 11, 2026.

Self-reported by Parker J. Smith: $81,000 in monthly revenue 85 days after launch Not verified by us.

Watch or read the source

The summary above is ours. Any income figures are the operator’s own claims, in the source.

More services and freelancing ideas

  • An espresso setup mounted on an electric-assist cargo trike that serves coffee at events without the overhead of a shop. The founder also builds and sells units to other entrepreneurs.
    Over $10k
    Side Hustle Nation, 2026
  • A physical escape room that parodies startup life, run day-to-day by a manager. Revenue is ticket sales.
    Over $10k
    Hacker News, 2019
  • Delivered freshly baked cookies to dorms and homes near a university on rollerblades, paid per order, and built a delivery management site.
    Part-time
    Hacker News, 2019
  • Purchased a website that sells custom YouTube intro videos at a low price per order, and aims to grow it and hand off tasks.
    Services and freelancing
    Hacker News, 2019
  • The operator builds search-ranked sites for local trades such as junk removal and auto glass, then rents the resulting phone leads to contractors for a flat monthly fee. Costs per site are small.
    The Koerner Office
  • A seller packages a website, review collection, Google profile and branding for local contractors and sells it by phone for a monthly fee. Leads come mostly from local Facebook groups.
    Services and freelancing
    The Koerner Office