GHL Magnetic Stirring Rod Replacement for Aquarium Dog Travel & Leisure The Two Little Fishies AccuraSea The Two Little Fishies AccuraSea Seawater Reference Solution is a calibration fluid made from natural seawater The 100% cotton rope also rewards appropriate chewing behavior while massaging teeth and gums The stirring rod s an essential component for automating the mixing of multi part solutions in advanced aquarium keeping Function: It is moved by a rotating counter magnet inside the main GHL Magnetic Stirrer unit to ensure that additives which tend to settle (like some amino acids or liquid vitamins) are well mixed before being dosed into an aquarium