There is already Sentinel X500 Inhibited Antifreeze in the system; can it be topped up?

If you are concerned that the level of protection is not adequate for your requirements, you can check the concentration of Sentinel X500 Inhibited Antifreeze in the system using the Sentinel FrostCheck Test Kit and top up as appropriate. If you would like to increase the concentration of Sentinel X500 Inhibited Antifreeze in order to strengthen its frost protection properties, please consult the product page for guidance on dosage rate and achieving protection at lower temperatures.


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