| It is my understanding that with a bead filter there is less oxygen in the filter and therefore a higher KH level would be beneficial. I have heard that 80 is an absolute minimum, but I have never heard that 100 - 120 is best for a gravity flow and that 175 - 200 is better for bead filters. I have always heard and have practiced keepeng KH levels higher for better function no matter what. Over filtering and increasing turn over rates is not a good solution for lower KH levels. A filter that is more efficient and higher levels of KH is always the best solution. |