Crystal Water Monitor

A sparkling pool or hot tub is a source of relaxation, but maintaining water quality can often feel like a guessing game.

Test strips provide inconsistent results, chemical levels fluctuate unexpectedly, and water can quickly turn cloudy or unsafe without frequent monitoring. Homeowners want to enjoy their pools, not spend time troubleshooting water chemistry.

Crystal Water Monitor eliminates the guesswork with smart, real-time monitoring and precise recommendations based on over 1,000 readings per week. The system includes a water-immersed sensor and an external monitor, protecting sensitive electronics.

At the helm of Crystal Water Monitor is Justin Miller, its co-founder and CEO whose journey into water monitoring began in 2014 leading to the launch of pHin in 2017.



pHin quickly became the top product in its category, offering pool owners a convenient way to test water quality. However, it was discontinued after being acquired in 2018 due to strategic changes during COVID-19. Recognizing the need for a more robust and precise solution, Miller leveraged years of experience in Silicon Valley, including roles at Apple, eBay, and Comcast, to develop Crystal Water Monitor—a superior product designed to eliminate the issues faced by pHin and other competitors.

Unlike pHin’s floating sensor design, which was prone to water seepage and eventual damage to electronic components, the Crystal Water Monitor is built for greater durability and accuracy. This strategic improvement allows the device to provide continuous, real-time readings without the risk of internal damage.

“We didn’t just build another product—we built a smarter, more intuitive solution that truly solves the real challenges homeowners face in maintaining their water,” said Miller.

Advanced Technology For Smarter Water Care

Crystal Water Monitor is more than just a sensor—it’s an intelligent system designed to simplify pool care. Using its mobile app, users can also input additional water chemistry data, including hardness, alkalinity, and cyanuric acid levels. The app also allows users to scan chemical barcodes for precise dosing recommendations, ensuring the right amount of chemicals is added to maintain balanced water conditions.

Unlike competing devices that test water chemistry just once daily, Crystal Water Monitor conducts over 1,000 weekly tests. This high-frequency monitoring enables users to track daily chlorine levels, pH balance, and overall water quality fluctuations, preventing common problems before they escalate.

The system uses oxidation-reduction potential (ORP), the standard measurement for most commercial pools, to measure sanitizer effectiveness, ensuring a cleaner and safer swimming environment. This feature is great for both pools as well as hot tubs, where rapid chemical shifts occur due to small water volumes and high temperatures. It detects these changes and delivers immediate recommendations, ensuring the water remains safe.

Smart Alerts & Precise Chemical Management

Crystal Water Monitor simplifies water care with its intuitive Monitor → Notify → Add process.

● Monitor: The system continuously tracks water conditions, analyzing chemical levels every ten minutes to ensure optimal balance.

● Notify: Users receive instant alerts for necessary adjustments and warnings about potential issues like freezing or overheating water, low battery levels, and unsafe conditions.

● Add: The app provides precise chemical dosage instructions, eliminating guesswork. By scanning a product’s barcode, users can get precise dosing recommendations, tailored for their specific pool and water chemistry, preventing overuse or underuse of chemicals. This keeps water safe and also reduces costs and environmental impact.

Crystal Water Monitor seamlessly integrates into any pool or hot tub system. Setup is simple—users place the sensor in the water and connect the monitor to their home Wi-Fi network. The system operates on three AA batteries, lasting one to two years, reducing maintenance needs. The mobile app, available on iOS and Android, provides real-time insights and guidance, making pool care stress-free.

As one of the many satisfied users shared, “The Crystal Water Monitor makes maintaining our hot tub effortless. With automatic notifications and dosage recommendations, it removes the guesswork from water maintenance. The water is always clear, which I could never achieve long-term without!”

Ensuring Long-Term Value With Continuous Support

The company operates on a subscription-based model to ensure continuous support and product longevity. The first year of service is included with the purchase, after which customers pay an annual fee of $99 (approximately $8 per month). This subscription covers free sensor replacements, ongoing software updates, and access to Crystal Water Monitor’s expert support team.

Customer service is a key priority, with all support representatives being Certified Pool Operators (CPOs). This ensures that users receive expert guidance whenever needed. The company fosters long-term customer relationships by providing continuous support and product enhancements.

Sustainable Water Care With Smart Technology

Crystal Water Monitor’s technology enhances user experience and also promotes sustainability. Providing precise chemical dosing instructions reduces chemical overuse, minimizing waste and environmental impact. Traditional pool maintenance methods often result in unnecessary chemical dumping due to inaccurate manual testing. Crystal Water Monitor eliminates this inefficiency by ensuring users add only the necessary chemicals.

Additionally, the device’s durable design minimizes electronic waste. The subscription model guarantees free sensor replacements, preventing the need to discard and repurchase new units. Users can access the latest advancements with continuous software updates.

The Crystal Clear Choice In Water Care

Crystal Water Monitor transforms pool and hot tub care by combining cutting-edge technology with a strong commitment to customer satisfaction. By learning from past experiences and leveraging advanced software and hardware integration, the company has created a solution that simplifies water maintenance like never before.

With real-time monitoring, AI-driven recommendations, and an intuitive mobile app, homeowners no longer struggle with uncertain water conditions. The subscription-based model ensures ongoing improvements and lifetime support, making it more than just a device—it’s a long-term solution for effortless water care.

As the company looks to the future, its dedication to innovation, sustainability, and a customer-first approach will continue to shape the industry.