ECOLOGICAL TREATMENT AGAINST VARROA.
 This treatment has to be applied twice a year, once in spring and once in autumn. After the first application, you have to repeat the treatment at 9 days. Ingredients for 30 doses:
240 gr. of Thymol (Thyme Essence). 
480 ml. olive oil.
Vermiculite. It is a green, fine-pored sponge. For sale to florists. preparation:
Heat the olive oil slowly. Dissolve the thymol in the olive oil. Cut the vermiculite lengthwise in half and crosswise in cuts of half of centimeter more or less, until obtaining 30 pieces of vermiculite (each piece 1 dose). We place the vermiculite supports in a container that we can seal hermetically and pour over the solution of olive oil and Thymol. We allow time for the vermiculite to absorb all of the solution. Place two pieces of vermiculite (1 dose cut in half) soaked in the solution on the squares. At 9 days, remove these and place another dose.