Industrial Water Treatment
See what your water-treatment skids are doing
— before the service call.
Modulink adds self-hosted monitoring — and bounded, non-safety-critical control — to skid-based water-treatment equipment. It reads the 4-20 mA instruments you already have, runs entirely on your site, and doesn't ask you to replace your PLC, your SCADA, or your instruments.
IN PRODUCTION — Falcon Water Technologies · Conroe, TX · RO membrane cleaning skids · since 2025 · Phase 3 · OEM — read the case study
Where The Fit Is Strongest
Skid-based equipment, already instrumented.
Modulink is strongest where water treatment happens on discrete, packaged equipment — a skid with 4-20 mA transmitters already plumbed in, and nobody watching them between site visits.
RO & CIP skids
Membrane arrays and cleaning skids with pressure, flow, temperature, and conductivity instruments already on the loop. This is where Modulink runs in production today.
Pump skids
Feed, transfer, and booster pump packages — suction/discharge pressure and flow read straight from existing 4-20 mA transmitters.
Dosing systems
Chemical dosing skids where you want a continuous record of what was injected, when, and at what line conditions.
If your equipment speaks 4-20 mA or 0-3.3 V, a Terminal can read it. Dry-contact devices connect via relay on the Terminal's actuator output.
The Deepest Use Case
RO membrane cleaning, stage by stage.
The most developed application is CIP monitoring for RO membrane cleaning. The Water Treatment Skill knows a cleaning cycle has stages — Clean, Soak, Flush, Rinse — and logs each one per vessel, with chemistry, on skids up to 48 vessels. Overpressure and overtemperature conditions raise banners and alerts.
If your business touches RO membranes or CIP, start there — it's the part of the platform with the most production miles on it.
Existing-System Fit
A complement,
not a replacement.
Two questions come up first: “does this rip out our instruments?” and “does it require cellular?” No, and no.
- Keeps your instruments — Terminals read the 4-20 mA and 0-3.3 V signals already on the skid.
- Runs alongside your PLC — Modulink observes and logs; your existing control logic keeps doing its job.
- Feeds your SCADA if you want — Modbus TCP integration at the Base Station, plus MQTT, REST, and Prometheus egress.
- No cellular required — Terminal Indi uses your on-site Wi-Fi/LAN. Nothing depends on a carrier.
The Local Architecture
Everything runs on your site.
A water-treatment deployment is Terminal Indi units on the skids and one Base Station on your network. There is no vendor cloud, no phone-home, and no cellular link anywhere in the path.
2× 4-20 mA inputs, an H-bridge output for bounded, non-safety-critical valve and motor actuation, 9–36 V industrial power. Mounts on the skid, wires to the instruments you already have.
Terminal Indi specTerminal Indi talks to the Base Station over your private 2.4 GHz on-site network. No SIM cards, no cellular contract, no cloud broker in the loop.
One ARM64 server per site runs the whole stack — dashboards, alerting, historian, user accounts, audit log. Air-gap capable. No telemetry leaves your site.
Security & data ownershipCommissioning is captive-portal — a Terminal joins your network the way a printer does. Deployments are measured in days, not integration quarters.
Scope, Stated Plainly
What Modulink is not.
Not municipal plant-wide SCADA
Modulink is built for skid-based equipment — discrete, instrumented packages. If you’re running a municipal treatment plant on a distributed control system with thousands of points, that’s a different product category, and we’ll tell you so.
Not safety-critical control
Modulink actuation is for non-safety-critical control — valves, dosing, motor speed. Safety trips live in Terminal firmware, local to the hardware, never over the radio. Anything your process depends on for protection stays in your existing safety instrumentation.
Not a rip-and-replace project
Your transmitters, your PLC, your SCADA stay. Modulink reads the same 4-20 mA loops and adds monitoring alongside what you run today.
Proof
Running in production since 2025.
Falcon Water Technologies (Conroe, TX) is an RO membrane-cleaning services company. Modulink has monitored their CIP cleaning skids in continuous production since 2025, and the relationship is now in Phase 3 — Modulink hardware is designed into Falcon's product BOM as OEM equipment.
A read-only integration feeds cleaning-cycle records into Falcon's ERP — deliberately read-only, so Modulink can never write into their business system.
Getting Started
Start with one skid.
RO/CIP Pilot
Instrument one skid and see your first cleaning cycles logged.
Learn moreTerminal Indi
The industrial field unit — I/O, power, and mounting details.
Learn moreSecurity & Data Ownership
Self-hosted, single-tenant, air-gap capable. Your data stays yours.
Learn morePricing
Terminal $500 · Base Station $1,000 · Skills licensed per Terminal, per month.
Learn moreSee it on your own skids.
Start with the RO/CIP use case, or tell us what your skids look like and we'll tell you honestly whether Modulink fits.
Get the One-Pager