Power Cleaner F8 can be dosed into the system up to a week before flushing. This high performance, strong cleaner is effective after one hour circulating under normal operating conditions.
After adding inhibitor to the system how long should I wait before re-testing the system water?
With the initial dose, its key to make sure the system water is circulated properly so that the inhibitor is sufficiently mixed. Fernox recommend that you let the system circulate for at least 15 minutes. Also having the system on hot will help speed this up.
