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TDSBot water monitor

Know your water.Before it costs you.

An inline sensor that reads your filter every minute. Alerts you before it exhausts. Free monitoring, for life.

Home · DIY · Espresso
TDSBot
1/4″ inline flow meter · TDS, conductivity, temperature & flow
1/4″ flow meter included. Fits most home RO systems, under-sink filters.
Larger sizes available for commercial:
3/8″ · 1/2″ · 3/4″ · 1″
NPT, BSP or Quick-fit connections.
Sensor readings

Measures every minute.
Reports what matters.

Four direct measurements. Four calculated indices. One inline sensor that installs in 15 minutes.

TDS
Total dissolved solids
1–2,000 ppm · ±2% accuracy. Your primary filter quality signal.
EC
Conductivity
μS/cm. Correlated with TDS — used to cross-validate readings.
°C
Temperature
1–50°C · ±0.5°C. Input to LSI and corrosion index calculations.
L/min
Flow rate & volume
Pulse-counted. Feeds the filter depletion model and leak detection.
LSI
Scale or corrosion tendency — calculated at 15°C, 93°C and 130°C
Larson-Skold
Steel corrosion risk — chloride + sulphate vs bicarbonate
Filter depletion
Days remaining with P10/P90 confidence bands
CaCO₃ load
Cumulative hardness through your appliance since last descale

Derived metrics require onboarding your inlet water chemistry (TDS, hardness, alkalinity from your utility report or lab test). Takes 2 minutes in the app. Filter depletion tracking is included with Monitor — LSI, Larson-Skold and CaCO₃ load are reported on Protect and above.

Free monitoring for life

No subscription.
No catch — on your first 1/4″ device.

Your first 1/4″ TDSBot or Pulse — the flow meter size most home RO systems, under-sink filters and single espresso lines use — comes with the Monitor plan included free. Daily readings, filter depletion alerts, and water quality reports, all included with your hardware purchase. No credit card at checkout.

When you're ready for hourly data, SCA coffee analytics or corrosion tracking at brew temperature — upgrade in the app or when your first monthly report arrives. Your call, your timeline.

Monitor plan · free on your first 1/4″ device
What you get from day one
TDS measurementEvery minute
Data uploadDaily
Filter depletion alert30 days notice
Monthly water reportEmail · PDF
Alert timingMidnight digest
iOS + Android appIncluded
CostFree · first 1/4″ device
Home espresso ownersUpgrade to Coffee Pro plan ($7/mo) for hourly monitoring, SCA water scoring and corrosion tracking at brew and steam temperature. Upgrade anytime — in the app or from your monthly report.
Optional upgrades

Start free. Upgrade
when the data earns it.

Your first 1/4″ device starts free. The plans below unlock hourly data, coffee analytics and fleet management — upgrade in the app when you’re ready.

Monitor
$2/device/mo
Billed monthly or annually (−15%)
Every minuteDaily uploadEmail alerts
TDS, Temperature, Flow — every minute
Threshold alerts when exceed your set levels
Predictive filter depletion (configurable, default 30 days)
Daily pass/fail status report
Multi-site fleet dashboard — corporate → store hierarchy
Full log per filter cycle — resets when filter/RO membrane is changed
ESG report
Protect
$3/device/mo
Billed monthly or annually (−15%)
Every minuteHourly uploadEmail alerts
Everything in Monitor +
Hourly upload
Data-driven filter change scheduling
LSI + Larson-Skold @25°C, 93°C and 130°C
Estimated hardness + cumulative hardness load
Full log per filter cycle — resets when filter/RO membrane is changed
Pro
$7/device/mo
Billed monthly or annually (−15%)
Every minuteHourly uploadEmail · WhatsApp soon
Everything in Protect
Multi-site fleet dashboard with LSI / LS view
Corporate → site hierarchy — ops team sees all, baristas see theirs
Monthly ESG water report — liters filtered, cartridges saved
Full log per filter cycle — resets when filter/RO membrane is changed
Everything included — no add-ons, no per-feature upsells.

All plans billed monthly or annually (−15%). Cancel anytime. SaaS upgrade available in the iOS / Android app or from your monthly email report.

Coming soon

TDSBot Pro —
local service, on demand

Not comfortable installing yourself? Book a local water treatment professional through the app for installation, filter changes and ongoing maintenance on your TDSBot.

Professional installationA vetted local pro installs your TDSBot and onboards your water chemistry for you
Filter change serviceTDSBot alerts you when your filter is due — book a pro to come change it from the app
Local networkCertified water treatment professionals available in your area — rated by TDSBot homeowners
Water testingInterested in a water test kit paired with TDSBot? Let us know — we're gauging interest
Water treatment professional?Join the TDSBot Pro install network — get matched with local booking requests.Join the waitlist →
For commercial accounts

Cafés, HORECA, facilities
& distributors

Commercial deployments, fleet management, RO manufacturer integration and OEM partnerships are priced on application — flow meter size, site count and plan tier all affect the right configuration. Get in touch and we'll turn around a quote within one business day.

Contact the team →
Specialty coffee chainsSCA inference · fleet dashboard · multi-site filter management
Hotels, restaurants & cateringCombi ovens, warewashers, ice machines · HACCP compliance logs
Water service companiesRoute optimisation · dealer account protection · resale programme
RO manufacturers & OEMDual-sensor reject ratio · white-label · API integration · no MOQ

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WaterTDS Inc
Inline IoT water quality monitoring for coffee, food service, water treatment, facilities and home filtration.
MQTT over TLS 1.3 · AWS IoT Core · ESP32-S
Disclaimers: TDSBot measures TDS, conductivity, temperature and flow rate directly. LSI, Larson-Skold Index, hardness and alkalinity estimates are derived from onboarded utility water chemistry data — not directly measured inline. TDSBot does not measure PFAS, bacteria, or other biological or chemical contaminants; for RO systems, reject ratio is used as a proxy indicator of membrane performance only. TDSBot monitoring data is not a substitute for accredited laboratory testing or statutory water quality compliance testing. All third-party brand names are trademarks of their respective owners; WaterTDS Inc. claims no affiliation, endorsement or partnership unless separately announced.

© 2020 - 2026 Water TDS Inc.  All rights reserved.

TDSBot® · PWSID cross-referenced · EPA SDWIS · SCA Water Standards