A cistern and rain tank water monitor
Rainwater starts soft and clean, then picks up whatever is on the roof and in the gutters. A monitor on the tank shows what each storm brought in.
What changes in a rain tank
- Turbidity rises when the first flush is missed or the screen clogs.
- Rainwater starts slightly acidic, so pH tells you how it is reacting with the tank and the roof.
- TDS stays low in clean rainwater; a rise points to something dissolving into it.
- Temperature tracks how the tank sits in the sun.
What the monitor reads
The WQM-1 reads pH, TDS, turbidity and temperature every 60 seconds and shows them in BlueSignal Cloud. Changes show on your dashboard. An email if the unit goes offline.
Sizing the tank first
The free tank calculator and the Rain Planner size a tank from your roof and your rainfall, and list rebates that may apply.
Drinking rainwater
Drinking use depends on the treatment after the tank and on local rules. A licensed plumber and your local authority decide it. Read the drinking-water guide for what treatment involves.
It does not test for bacteria, nitrate, arsenic, lead or PFAS. Those still need a lab test, and the PFAS check shows what EPA has on record for public systems near you.
Questions
Where does the monitor go on a cistern?
On the outlet line from the tank, before any treatment, so it reads the water the tank holds.
Does it work on a metal or plastic tank?
Yes. It reads the water in the line, not the tank wall.
Does it check for bacteria?
No. Bacteria need a lab test.