Hmmm...responded to this post yesterday but...????

You're fighting a losing battle unless you first eliminate the source of the brown water. Likley tannins from decaying leaves/debris or perhaps submerged pots with peat in the planting medium.

It's an exercise in futility to treat *symptoms*. Always search for the root of the problem and correct it first. Once the problem is eliminated, the batting should do the trick. Sorry - in a rush here but search for Horton's post using a trash can & batting to filter your water.

Follow his advice and you will be enjoying clear water this time tomorrow:)