Swim University: a pool-care blog that publishes its income and crossed $1M a year

Swim University is a how-to site about pool and hot-tub care, started by Matt Giovanisci in 2006 as a side project while he worked in a pool store. It is one of the most useful case studies on this site for one reason: since 2015 Giovanisci has published detailed annual income reports on his second site, Money Lab, so the figures below are the owner's own, not estimates.

The property

A content site with roughly a thousand articles and a YouTube channel, aimed at people who own a pool or spa and need to fix a specific problem: cloudy water, a green pool, a broken pump. Traffic is seasonal and intent-heavy, peaking in late spring and summer at well over a million pageviews a month in North America, which is exactly the audience pool-supply retailers and manufacturers want to reach.

The revenue mix

The 2021 report put the year at about $1.1 million, split roughly three ways:

• Display advertising through an ad management partner (Raptive (formerly AdThrive), then AdThrive), running header-bidding units across the article pages. Pool care is a home-and-garden niche with strong US traffic, so RPMs sit well above the general-blog average during the season.
• Affiliate marketing, mostly Amazon Associates links to test kits, chemicals and equipment placed at the moment an article tells the reader what to buy, plus a handful of direct programmes with pool-supply retailers.
• Digital products: the Pool Care Handbook and Hot Tub Handbook (ebooks), and later video courses, sold through his own checkout. These carry the highest margin and, importantly, do not fall with ad rates in January.

Why it worked

The three lines reinforce each other. The same article that earns display revenue from a casual searcher earns an affiliate commission from a reader who buys the recommended product, and pitches the handbook to the reader who wants the whole system explained. Giovanisci has also been explicit that the email list, built from a free "pool care cheat sheet", is what sells the products: the traffic is rented from Google, the list is owned.

Two other decisions stand out in the reports. He kept the ad density moderate rather than maximising RPM, on the theory that a reader who trusts the site buys the book. And he treated the products as the business and the ads as the floor, which is the pattern that runs through most case studies here.

What to take from it

A single-topic content site in a niche with real purchase intent can carry three methods at once, and the highest-margin one (products) only became meaningful because the free content had built trust for years first. Run the calculator with a home-and-garden niche and a million pageviews and the display line alone lands in the same range Swim University reports; the products are the difference between a good site and a business.