The Sutro Monitor is the piece that floats in your pool (or spa). The unit is about the size of your forearm. The box comes with two rechargeable batteries, one is in the monitor (so it can have power), this gets swapped out once a month. The other battery remains to charge in the Hub & Charger unit, while the Sutro is the workhorse that tests your pool (or spa).

The monitor will test your water to get data on pH, free chlorine, bromine, total alkalinity and temperature 3x per day. The monitor is paired with Sutro’s APP (both on iOS and Android), and it will show you the results as well as advice on how to balance your pool’s water chemistry in case it is necessary.

The Sutro Smart Water Monitor is an innovative solution for anyone who wants to have a perfectly balanced pool or spa without having to deal with water samples, test strips, or messy test kits. It reads your water to get data on pH, free chlorine, bromine, total alkalinity and temperature. The monitoring is done 3x per day and is viewable on your smartphone.

All you need to do is drop the monitor into your pool and check your phone for up-to-date readings and advice on how to balance the water chemistry. Click here to see how it works.

The initiation fee costs $499 and it includes all of Sutro’s hardware:
- Hub
- Sutro Water Monitor
- Test Cartridge
- 2 Rechargeable Batteries

Then for as little as $29/month (or $39 if you go Premium) you can get on-demand cartridges sent to your doorstep. With this you’ll be able to test pH, Free Chlorine, Bromine, Total Alkalinity, & Temperature 3x per day. Each cartridge lasts about 30 days. This monthly pricing also gets you the free iOS + Android Smartphone App, Expert recommendations based on the chemicals you own, E-mail and Chat Support.

You can pause your Sutro subscription any time and for as long as you want directly from Sutro’s mobile App.

We work with all sorts of chemicals. Our database of chemicals is expanding daily. When you first start using the Smart Monitor, we ask you to scan your chemicals so we know which ones you are using. If they are not in our database, then we’ll put them in. Since we use an Artificial Intelligent recommendations engine, our system can adjust to whatever chemicals you may have.
Rest assured that whatever chemicals you are using, they will work for us.

You can take it out of the pool or spa but we don’t recommend doing that. We want to make sure that we’re testing your water regularity and the best way to do that is to keep it in the water.If you do need to take it out, that should not be a problem. The Smart Monitor knows that it’s out of the water so it will let us (and you) know.