A general purpose cleaning solution usable in a variety of applications and now available in easy-to-use 20ml sachets. The single does sachets are really handy with each sealed sachet holding just the right amount of solution. Each time a meter or electrode is cleaned using the Hanna sachets, it is like using a newly opened bottle of solution! Electrodes become direct from use and will product inaccurate results even if they read correctly in a pH buffer. This solution elminateds impurities and residues which are left on electrode surfaces when immersed in samples during measurement or when stored incorrectly. For general cleaning, soak Hanna General Cleaning Solution for between 30 minutes and 1.5 hours to dissolved mineral deposits and other general coatings (non-agressive formula). 25 packs of 20ml sachets.