The SafeDip’s chlorine readings are based off of the ORP readings. ORP stands for Oxidation Reduction Potential.
ORP measures the how effective the sanitizer is in your pool or spa. The ORP measurement ranges on the SafeDip are between 500mV to 800mV.
The North American standard for ORP is in the range of 650 – 750mV. So with this understanding, the
SafeDip will provide you the chlorine readings as follows:
Low: if the ORP reading is below 650
Good: if the ORP reading is between 650 – 750mV
High: if the ORP reading is 750 – 800
SafeDip ORP reading
- If the ORP is below 500mV the ORP will read “LO”
- If the ORP is above 800mV the ORP will read “HI”
ORP is a better way gauge how sanitary a sample of water is as opposed to just measuring free chlorine. There are a number of scenarios where you will test your water and have good levels of free chlorine but still have a cloudy or green pool. This can be caused by phosphates, improper pH levels or even too much stabilizer in the water. Testing by ORP would show in all the above scenarios a low ORP, indicating something in the water is preventing your sanitizer from doing its intended job, allowing you to correct the issue before it turns into a bigger expensive problem.