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Thank you Slugbaby, that is useful to know. I had visions of broken pumps and all sorts! Do you think the inhibitor will still be effective? I am tempted to add another bottle just in case if this in itself is not damaging to the system.

After draining our system to add a new towel ladder in the bathroom, I used a bottle of Wickes inhibitor that I have had for around a year. As I poured the last of it into the header tank I heard something fall into the tank. I fished out several large crystals before they could go down the pipe...