WaterGuru Sense S2 Smart Pool Monitor – Digital Pool & Spa Water Tester for Chlorine, pH, CYA & Alkalinity – Wi-Fi Enabled – Includes C5 Cassette, Float Ring & Batteries

Purchased my WaterGuru in 2024, and in December of 2025, it kept failing to measure. I contacted customer support and it turns out I had a bad motor on my unit. Joan was awesome and ended up sending me a new unit for no charge. I will admit, before the unit crapped out on me, WaterGuru has made it super easy to help maintain the proper chemicals in my pool year-round.

This thing can’t get a level right. I spoke with customer service and was assured that my unit was working correctly. Even the company doesn’t want it back. A complete waste of time and money. Giving incorrect PH and chlorine levels it can’t even get the temperature right.

I had the V1 of this and then later bought the V2 — and I love both. The updates are noticeable and it works even better this time around. Makes pool maintenance so much easier and less of a chore. Sturdy, reliable, and genuinely helpful to have around. Highly recommend if you want something that actually simplifies the job!

Pros: Testing seems to be pretty accurate. App is free and makes it convenient to monitor the pool conditions. The app gives suggestions and tips on improving various levels. Cons: Testing is done through cartridges. If you only test the water once per day, each cartridge will last about a month. A 5-pack of cartridges is $150... which is a little spendy. My biggest complaint is the battery life. The unit takes 4 C-cell batteries that only last about 2 weeks (based on Arizona heat in July-Aug). I would think a solar powered unit would be a better eco-friendly option.

For the money this is a very good water testing system. I use it to monitor a remote pool and it works well for that purpose. It sits in the skimmer & tests the water daily. You can set the time of day, but no option to skip test days. I think I used two cartridges a season in NorthEast. It tests free chlorine, pH, water temperature & water flow at the skimmer. It has helped immensely, but disappointed it stopped responding after two seasons. Worth the money & relatively inexpensive compared to the few competitors. Cartridge 5-pack is $50. It is accurate & does require wifi to work. They provide water testing for detailed analysis, but my two tests did not get uploaded this season. You can manually upload detailed pool test data if you have a local tester. This house is remote so testing water locally is challenging. The app interface is easy to use & they calculate estimates for what product to add based on pool size. You can have multiple units & share the access to family members. Worth the money, no green pool for two years. Buy long lasting Lithium C batteries, the extended use is well worth the extra cost.