The Sutro and pHin alternative
Updated:
If your Sutro or pHin monitor was discontinued, you don’t have to buy another expensive device. DoseMyPool does the chemistry in software: enter your test numbers and it tells you exactly what to add for your pool, hot tub, or saltwater.
What happened to Sutro and pHin?
Both connected pool and spa monitors were discontinued and are no longer supported, which left a lot of owners without the dosing guidance they had come to rely on. The floating sensor was never the valuable part. Being told exactly what to add was.
You don’t need to replace the hardware
A basic test kit or test strips plus DoseMyPool gives you the same answer the monitor did: the precise amount of each chemical to add for your water. There is no device to buy, no cartridges or reagent pods to replace, and the core app is free.
What to look for in a replacement
Pick a tool that gives exact doses (not just target numbers), covers pools, hot tubs, and saltwater, works offline at the poolside, keeps your data private, and has a genuinely useful free tier. DoseMyPool does all five.
Sutro and pHin vs DoseMyPool
| Sutro / pHin | DoseMyPool | |
|---|---|---|
| Status | Discontinued | Active and updated |
| Hardware | A floating monitor, plus a hub and cartridges for Sutro | None: any test kit or strips |
| Ongoing cost | Sutro: $29–39 a month plus cartridges | Free tier, optional Premium |
| Pool, spa, saltwater | Varies by model | All three |
| Works offline | No: devices and apps stopped working at shutdown | Fully offline |
FAQ
Is Sutro discontinued?
Yes. The Sutro monitor was discontinued, so it no longer provides readings or dosing guidance. DoseMyPool replaces that guidance in software, with no hardware required.
What is the best Sutro or pHin alternative?
If you want exact dosing without buying another monitor, a software app like DoseMyPool is the simplest path: enter your test numbers, get the precise amount to add, log it, and get reminders. It works for pools, hot tubs, and saltwater.
Do I need a pool monitor at all?
No. A basic test kit or strips plus DoseMyPool gives you the same what-to-add answer a monitor did, with no hardware, no refills, and a free core app.
Sources
- Test Your Own Pool, Sutro Smart Pool Monitor review. Sutro, Inc. ceased operations; devices and the app stopped working after October 31, 2025
- Pool Supply Warehouse, Important Message for pHin Customers. Hayward ended the pHin service on December 20, 2021, and the monitor stopped measuring
- The Pool Nerd, Best Pool Water Monitors. Sutro needed a $29–39 monthly subscription, cartridges and a hub
- DoseMyPool, Pricing. What the free tier and Premium include
Related
Stop guessing. Get the exact fix
DoseMyPool turns your test numbers into the precise doses and the safe order to add them. Free on the App Store.
DoseMyPool is independent and is not affiliated with, endorsed by, or sponsored by the other products named on this page. Product names and trademarks belong to their respective owners and are used only to describe and compare. Details reflect our understanding when written and can change, so check each product's current information before deciding.