Hi, can any one please offer some sound advice. I have Apistan in four of my hives. They have approximately 3 weeks to go before they need removing. Two hives are not in a good state, and the Apistan does not seem to be effective enough. Does any one know if I can use another set of strips once the first set comes out. I do not want to harm the hives. I use Bayvarol normally in spring, all hives have enough stores, pollen etc. I hope some one can help.