oOMO3NOo;1865264; said:ya i didnt think it would help that much either but it really did i was amazed this is a picture on someone elses tank that had carbon in the filter and it was tea colored so they added this stuff and you can see how much clearer it is plus this is a good jornal to read if you going for a fully planted tank.
I ordered some . Its rated for 100 gallons for 6 months thus I imagine in a 90 gallon pond with lots tannic acid it should last about 2/3 months it was cheap enough so will simply replace it when exhausted if it works.
Thanks
