ORP measures (REDOX)

The ORP measurement indicates the level of active disinfection in your pool or spa.

For optimal disinfection of water at 25°C, international standards recommend ORP / Redox measurements between 650 and 750mV.

On your ICO application, you can find the ORP trends by clicking on thetrend icon.

If action is required on your part, ICO will send you a recommendation.

Normal variations in ORP measures

Fluctuations in ORP measurements may be normal. Depending on the weather or swimming conditions, ICO may detect changes between two consecutive measurements.

Possible ORP measurement anomalies :

Your ORP is low

You have just filled your swimming pool or spa

• Il est normal d’avoir un niveau de désinfection bas si vous venez de remplir votre bassin. ICO vous fera bientôt de recommandations pour augmenter le taux de désinfection.

Your pool or spa was already full

Your ORP is high

In this case, you will need to measure your stabiliser level (using a test strip, for example):

• Result 0-30 ppm the pool/SPA does not have enough stabiliser, the REDOX drops very quickly when chlorine is added. You need to increase the stabiliser level to achieve perfect disinfection.
• 30-50 ppm measure: ideal rate for pool/ SPA
• 50-60 ppm measure : the level is high but still acceptable. You can simply change your disinfection method by using non-stabilised chlorine.
• Result > 60 ppm: The level is very high, you can drain part of the volume of water in the pool or SPA (by changing half the water, you will halve the stabiliser level) OR use a stabiliser reducer. 

Your ORP fluctuates

You observe a variation greater than 200 mV between two measurements: if you have not carried out a recent chemical treatment that could explain this large variation, contact our support service.

Too regular ORP fluctuations

In this case, it may indicate a fault in the treatment of your pool or spa.

Check the following information:

How filtration works.

• If your filter is not working properly or the filtration time is insufficient, the rate of disinfection will not be uniform in your pool or spa. The ORP level can also change depending on the position of your ICO in the pool.

• Clean the filter regularly and check the filtration system during weekly maintenance to ensure that the ORP is even in your pool.

The electrolyser

In salt-treated pools or spas, sometimes you just need to change the injection settings on your chlorinator to restore a stable ORP. Also, if the chlorinator malfunctions, the ORP (disinfection rate) will be unstable. Checking that it is working properly is part of the weekly maintenance recommended by Ondilo.

Your ORP measure seems wrong

Couldn't you find an explanation for this anomaly in the article? contact the helpdesk.

Your ORP sensor cannot be calibrated

Make sure you have followed all the calibration steps. If you still have a problem, contact our helpdesk.