What Should The GH Level Be in My Pond?

The ideal GH (general hardness) level for a pond is between 10 and 15, as the organic components in the pond and the filter require approximately 8 to function effectively. If your water supply has a GH level of 8 or higher, typical water changes are sufficient to maintain the desired GH level. If the GH level is low you could add some NT Labs Koi Care GH Minerals Up