For those concerned about trace element build up using Oceans Blend 2 part the results are in. I have a customer that has been using Oceans Blend for about 12 years now. They had their main tank tested using an ICP test. The only element that came back out of wanted parameters was Potassium in a 450ppm range. This maybe due to the gallon of potassium they ordered and had been using. The good thing about this tank is it uses only natural seawater so there is zero influence by synthetic sea salt.