Never push the floral foam down with your hands to immerse it. Let it float freely in the container.
Use enough water to saturate the foam. By doing so, you will make more reserves in water available to  the flowers.
Never place many blocks of floral foam in your container holding water, as some of them will prevent the others from absorbing the water and the foam will become too light, since it will not have absorbed enough water.

It is not necessary to use nets when working with products manufactured by FENOCOL.
Floral foams represent less than 7 % of the total costs of raw materials in floral arrangements. Therefore, replacing them with  products of lower quality will not incur in any significant cost reductions or savings. Bear in mind that what is at stake is both your reputation as a florist and the image of your business, so do not take risks for just a few cents. Do not let your florist shop get withered.