Brown algae

[jws444]

Using a Brita filter is essentially the same as quickly running tap water through activated carbon. It will 'refresh' the taste of the water, and probably take out a bit of the chlorine, but that's about it. The Brita filters are not cheap either. For the same price it takes to buy these things, you could get some ro/di water from stores. Just take a browse down the aisles and read the labels. You will eventually find distilled or ro/di water. These will be perfect for you to use short term, or longterm if you have a very small tank.