Seawater is very important in the marine aquarium – not a big surprise really! It needs to be of high quality and kept that way.
There is an article titled as above on the Marine Depot website. It was supplied to Marine Depot by Aquarists Online and I thought I’d bring it to your attention as it should be of interest to anyone, particularly relatively new aquarists. The article deals with many aspects of seawater and what can happen to it as it ages. There are a good few positive comments about the article from readers.
The link is below. While on the website why not have a look around.