Hi. I'm Marco.
Your free pool guy. Test your water and I'll tell you if it's ready to swim, what to add, and exactly how much.
Free. On the web now; iPhone coming soon.


Can I swim?
Log a test with a tap for each reading. Marco says swim-ready, needs a little help, or hold off.
One step at a time
What to add first, how much for your pool's size, and why. Then the next step.
Ask Marco
Cloudy, green, a pH that won't stay put: ask about your pool and get an answer for your water.
Find a pro
A new pool, a resurface, weekly service or a repair. Marco asks a few questions and sends it to one Waterline pro near you.
Your details stay yours
You decide who hears from you.
- A pro gets your project and contact details only when you tick the box and press send.
- Offers from pool companies near you are your choice, off unless you turn them on. At most 2 a month, and your email and phone stay private until you answer one.
- Share your tests with your pool company only if you want to. Stop any time.
Marco's amounts are guides for your pool's size. Follow the label on every product, handle chemicals safely, and ask a pro when you're unsure.

