Thats absolutely right. Thats the whole point of bioballs in fact. Otherwise we'd just use marbles. A bioball has many times the surface area as the sphere in which it is contained. The actual surface area differs by manufacturer.boredatwork said:i dont use bioballs, but having seen pictures of them i dont think the surface area of the bioball exposed to the water corresponds to the surface area of a sphere,
Its a little more than off the mark. The whole point of bioballs is the surfaces WITHIN the sphere, not the sphere itself. Calculating the surface of a the sphere to figure out how much bio surface material you are going to have is like measuring the OUTSIDE of your house to figure out how much paint you need to paint the INTERIOR walls.swamptrout said:also thanks for the formula, although others may think it to be a little off the mark it definitely does give me some sort of an idea.
I really think that is the only way to get a real answer. I think that assuming that the difference in outside surface area is an accurate inference the manufacturing differences between the two sizes is too large an assumption. If you are creating a theoretical mathematical model and treating them like fractals the I completely agree with you. Bottom line, look up the manufactures specs to see what the surface area/gallon is and thats all the info you need.b_justb said:Or, and a much easier way, we could just read the manufactures specs on each product and it gives you the exact surface area for a given amount of product.