| Witz, If you post this over on the pond forum, you might get more responses. A few of the ponders there (including myself) have "bog-type" filters. This Bog Garden forum (I think) deals more with the "true" bogs-- that is, separate bogs filled with peat that don't usually have water running through them. In the meantime you can take a look at the construction of my bog-type filter at the link below. BTW- we used all pea gravel-- no lava rock in our filter and it seems to be doing well after 2.5 years. Another website that might be useful is Nelson's Water Gardens in TX, I think. Just google their name along with "bog filter". |
Here is a link that might be useful: Our Bog Filter