Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? :: Clearing a brackish pond in the Bahamas ::

Tannins tend to make the water acidic. In theory you could test the PH with a pool or hot tub strip to get an idea.

Calcium carbonate or crushed sea shells will absorb the tannins and neutralize them. Depending on the mesh size of the product added the faster the reaction will be in clearing up the water. Most likely this could be a maintenance thing if the tannins are leaching in from other sources.

Test in a bucket and take a look. A quick test if you do not have any PH paper is add house hold ammonia to a bucket of pond water. Just a tea spoon at a time. It should go murky then titrate like snow to the bottom of the bucket. This will give you an idea of the PH. If the PH is high the ammonia will have no effect on the water. If you put to much ammonia in to fast it will have little to no effect on the water. Slow and steady.

Cheers Don.