They contain 'munchie bugs' that eat oil and diesel, turn it into CO2, They last approx two to three months, Keep the smell at bay which can add to the feeling of sea sickness. The great thing about these is that you can confidently throw it away in the bin when finished, and know your not hurting the enviroment.
I tried them after seeing Al Jones use them in all his vessels, he swear's by them.
Contact him at alan@atsailing.com, he'll share his info with you, and tell you all about them and where you can get them.
He has one next the bilge pump on his RhIB, it keeps the slippery film of fuel at bay. Under his engines on his Yachts, and in his Power boats.
Try them, a product which actually works as recommended by a yachtie not the company.
Good luck
Pickle
