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WaterGuru Cassette C2/C5 Combo - 3 Pack
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SENSE 2 for Pools & Spas

50,000+ Happy Customers
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Our patented technology tests your water’s chemistry daily and sends updates to your phone, Apple Watch, or Alexa—no app subscription required—for safer, cleaner water. Get readings, alerts, and guidance for pH, free chlorine, cyanuric acid, total alkalinity, calcium hardness, pump flow, and temperature.

  • Lowers chemical costs by 34%, energy by 18%, and green water by 99%
  • Extends the life of your pool or spa and equipment
  • C5 cassette (one included) for one month of daily testing
  • 4 C batteries required (not included)

SENSE 2 for Pools & Spas

50,000+ Happy Customers

Our patented technology tests your water’s chemistry daily and sends updates to your phone, Apple Watch, or Alexa—no app subscription required—for safer, cleaner water. Get readings, alerts, and guidance for pH, free chlorine, cyanuric acid, total alkalinity, calcium hardness, pump flow, and temperature.

  • Lowers chemical costs by 34%, energy by 18%, and green water by 99%
  • Extends the life of your pool or spa and equipment
  • C5 cassette (one included) for one month of daily testing
  • 4 C batteries required (not included)
Choose SENSE Model
SENSE 2
How will you use your SENSE 2?
Pool Skimmer Shape
1
Save 10%
$314.10 $349

For Residential Use
Lodging, Property Managers & Pool Service Providers Click Here

For Residential Use
Lodging, Property Managers & Pool Service Providers Tap Here

Perfectly balanced
pool and spa water everyday

Perfectly balanced
water everyday

Meets and exceeds professional DPD testing standards for accuracy so you can trust your pool readings.

With our app, you can
see your up-to-date water
chemistry, water temperature
and pump flow

Receive professional
water treatment advice
on demand

<h2><strong>Perfectly balanced</strong><br/>pool and spa water everyday</h2>

Keep track of your pool or Spa water
quality
and take preventative action to maintain chemical levels.

pH

Balance of
Acid and Base

Unbalanced pH makes water acidic and corrosive, which causes itchy skin and red stinging eyes for swimmers and damage to pool and equipment.
FC

Free
Chlorine

Monitors free chlorine level (up to 25 ppm) to ensure proper sanitation and algae prevention without over dosing which is dangerous for swimmers.
TA

Total

Alkalinity

Proper alkalinity levels ensure stable pH, which prevents fluctuations known as "pH bounce".
CYA

Cyanuric
Acid

Excess CYA from long term use of Trichlor tabs captures the free chlorine from your water, eliminating sanitation and causing algae growth.
CH

Calcium
Hardness

Maintaining calcium hardness is crucial to protect the pool surfaces and equipment from corrosion or scaling.

Importance of
water chemistry

<h2>Importance of<br/><strong>water chemistry</strong></h2>
Unhealthy water
Not safe for swimmers
Unbalanced pH
Damages your pool
Corrosion
Damages equipment

Compare WaterGuru
to other smart pool devices

Waterguru
Aiper
Crystal Monitor
Manual
Measures ppm chemistry
Waterguru
affirmative mark
Aiper
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Crystal Monitor
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Manual
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High accuracy measurement
Waterguru
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Aiper
negative mark
Crystal Monitor
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Manual
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Chemicals measured
Waterguru
5
Aiper
2*
Crystal Monitor
2*
Manual
5
Chlorine measurement
Waterguru
affirmative mark
Aiper
negative mark
Crystal Monitor
negative mark
Manual
affirmative mark
Chlorine up to 25ppm
Waterguru
affirmative mark
Aiper
negative mark
Crystal Monitor
negative mark
Manual
negative mark
Pump flow diagnostics
Waterguru
affirmative mark
Aiper
negative mark
Crystal Monitor
negative mark
Manual
negative mark
Temperature custom alerts
Waterguru
affirmative mark
Aiper
negative mark
Crystal Monitor
negative mark
Manual
negative mark
Expert sourced advice
Waterguru
affirmative mark
Aiper
negative mark
Crystal Monitor
negative mark
Manual
negative mark
Auto measures
Waterguru
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Aiper
affirmative mark
Crystal Monitor
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Manual
negative mark
Annual supplies
Waterguru
Cassettes
Aiper
Cartridges
Crystal Monitor
Annual Fee
Manual
Test kits

* ORP based systems (all but WaterGuru) do not measure Chlorine, they only estimate a sanitation potential

50,000+ Happy Customers

No more driving to Leslie’s.
“I bought my Water Guru because I was tired of driving to Leslie’s for water testing.Now I get my test results daily with advice on how to correct the water chemicals.”
Richard W, Texas
No more trouble. My pool is in perfect, healthy balance.
“It took one week to get my pool in perfect balance and has stayed that way all this year.Love it and it gives me daily readings of the water quality.I am using less chemicals than before and I never have to leave my house to get my reading.”
Edward L, Louisiana
Saving money and headaches.
“If my pool's free chlorine or Ph goes out of range, I get an alert on my phone. Tests daily or on demand.Finally, something with a price affordable for individual consumer.You will save in chemicals and headache medicine to recover the cost.”
Le Shek, California
Protecting my pool investment.
“I had a very low flow sensor warning my Water Guru.After looking into it, my pool filter was clogged.If It wasn't for the Waterguru. My pump would have burned out. Thanks for saving me a lot of money and stress.”
Luis M
Even when life gets busy the pool is tested.
“I am retired, and didn't think I would need/want something like the WaterGuru. But it sounded interesting so I bought one. I'm so glad I did.Those times when pool maintenance gets away from you, or because your away from home for a few days, you can always check on the fly to make sure everything is where it should be when it comes to your chemicals.”
David A, Arizona
Far better than test strips.
“The first thing most people are going to say is that it’s expensive, and I can buy lots of test strips for that price.Both items are valid, but the big difference is you are getting accurate readings and tracking of data.A test strip only gives you an approximation of where your levels are at.It’s a guessing game as to what the accurate reading is based on color.Guess wrong, and you are either out of balance or wasting chemicals.WaterGuru saves me money.”
Brad B, Michigan
Eliminated pool service problems.
“After years of problems with a once-a-week pool service I purchased the WaterGuru SENSE and have been extremely impressed with the ease of maintaining balanced chemistry each and every day.I have saved money and eliminated the problems with a pool service and I am extremely pleased with the ease of maintaining my pool myself.”
Larry W, Florida
No more stress.
“Before purchasing the WaterGuru SENSE - I would frequently stress about the condition of my pool.Since using this product, my pool has never looked better.Everyone compliments how clean our pool is.”
Neil D, Illinois
The perfect tool for the job.
“I have been using WaterGuru for over a year now and it's the perfect tool. The historical graphs and the daily status on PH and Free Chlorine have given a much better analysis to keep the pool in a balanced state. Now, I can understand how rain, heat, and sunlight affect the pool chemical level without spending a lot of time performing the measurements.”
Wayne K, Texas
A Waterguru Neighborhood.
“The WaterGuru is awesome! It has really made maintaining my pool easy, for the most part eliminated having to check my chemicals with a test kit which was a hassle. Love the chemical readings coming to my phone, it's a great app! I have now had four neighbors buy the WaterGuru.”
Lee L, Georgia
Feeling confident to manage my pool well.
“The ease of pool care has gone up tremendously with the Waterguru! I never used to do it myself, but I now feel confident to be able to take it on and I enjoy it.”
David W, Texas

Water Quality

SENSE S3

  • WaterGuru SENSE S3
  • SENSE C5+ Cassette
  • Quick Start Guide

SENSE S2

  • WaterGuru SENSE S2
  • SENSE S2 C5 Cassette
  • 4 “C” Batteries
  • Float Ring for Spas and Above Ground Pools
  • Quick Start Guide

SENSE S1

  • WaterGuru SENSE S1
  • SENSE S1 Cassette
  • 4 “C” Batteries
  • Quick Start Guide

The WaterGuru SENSE is a smart digital pool water tester that’s installed on your skimmer with its Sensor dangling in the water in the skimmer basket.

The WaterGuru SENSE 2 and 3 use patented optical technology to measure daily the Free Chlorine (FC), acidity (pH), Total Alkalinity (TA), Cyanuric Acid (CYA) and Calcium Hardness (CH) of your pool water.

The WaterGuru SENSE 1 uses patented optical technology to measure daily the Free Chlorine (FC) and acidity (pH) of your pool water.

You can monitor your pool conditions through the WaterGuru app. If your water chemistry parameters measure too high or too low, Advice will appear in the WaterGuru App to show you how to resolve the problem.

WaterGuru’s Advice is customized to your pool. The Advice is based on your pool type, i.e. plaster, vinyl, indoor, outdoor, covered, not covered, and pool size as well as the types of chemicals you use to regulate FC and pH. The Advice in the App will show you what chemicals you need to add to your pool to bring these chemical measurements back to the normal range.

Yes. The WaterGuru SENSE comes with a 30-day money back guarantee and 1-year Warranty. 

No.  We don’t believe in subscription fees.

The WaterGuru SENSE 1 digital pool water tester measures daily the Free Chlorine (FC) and acidity (pH) of your pool water using the supplied cassette. The SENSE S1 also measures the temperature, and the flow of your pool water.

The WaterGuru SENSE 2 and 3 digital pool water tester measures daily the Free Chlorine (FC), acidity (pH), Total Alkalinity (TA), Cyanuric Acid (CYA) and Calcium Hardness (CH) of your pool water using the supplied C5 cassette. The SENSE S2 also measures the temperature, and the flow of your pool water.

Yes.  Even though it does not measure salt, the WaterGuru SENSE works just fine in salt water chlorine generator pools with salt levels up to 5000 ppm.  Click here to learn more.

The SENSE 1 does not work in Hot Tubs or Spas but the SENSE 2 and 3 do work using the the optional Float Ring (included in S2).

SENSE 3 is solar powered. It uses approximately one hour of full sunlight per day. Without sunlight (shaded pools, covered spas, or indoor pools) the SENSE 3 will have power for approximately 9 months. There is a USB C port on the top of the unit that can be used to charge the device if necessary. WARNING: DO NOT OPERATE THE UNIT NEAR WATER WHILE CHARGING OR WITHOUT THE USB PLUG COVER.  TO DO SO WILL VOID THE WARRANTY. 

SENSE 1 and 2 WaterGuru C size batteries last for approximately 6 months. Performance may vary based on the brand of batteries used. WaterGuru recommends using ‘Energizer’ brand batteries which we have tested extensively.

WaterGuru SENSE Cassettes hold strips of sensing pads that measure water chemistry parameters.

The WaterGuru C5 Cassette measures Free Chlorine (FC), acidity (pH), Total Alkalinity (TA), Cyanuric Acid (CYA) and Calcium Hardness (CH), lasts one month and is designed for the SENSE 2 and 3 devices.

The WaterGuru C2 Cassette measures Free Chlorine (FC) and acidity (pH), lasts 2 months and is designed for the SENSE 2 and 3 devices.

The WaterGuru SENSE S1 Cassette measures Free Chlorine (FC) and acidity (pH), lasts 2 months and is designed for the SENSE S1 device.

SENSE is not currently available for shipping outside of the U.S. Check back frequently for updated information.

You can purchase WaterGuru right here on our website.

The WaterGuru C5 Cassette which measures Free Chlorine (FC), acidity (pH), Total Alkalinity (TA), Cyanuric Acid (CYA) and Calcium Hardness (CH) is designed to last 1 month based on daily water measurements.

The WaterGuru C2 Cassette which measures Free Chlorine (FC) and acidity is designed to last 2 months based on daily water measurements over a 2-month period.

The WaterGuru SENSE S1 Cassette which measures Free Chlorine (FC) and acidity is designed to last 2 months based on daily water measurements over a 2-month period.

Note: Performing additional water measurements will reduce the life of the cassette.