I bought the sand because I've read that it is pre-cleaned and can be used immediately, because I wanted to do it in an already broken-in aquarium. When I wanted to wash out the sand is short I only noticed how incredibly dusty it was. After washing several times I got the sand then the AQ the next 2 days was then milky. Next time I will prefer to use a sand from the hardware store because of cheaper and is certainly not dirty ...
(I have to say I've contacted the manufacturer JBL and gave me a free detergent fed sand as compensation ...)
