I've read some about using bleach, but was afraid it would negatively affect the fish. I'll look into it further.
I have seen picture of the column method you're describing. Thank you for explaining it in detail! I appreciate it greatly. I may try this also, since it seems like the easiest method to construct.
I asked our well driller about GPM, but haven't heard back yet. We think it puts out at least 100-120 GPM.
Thank you so much.
