I have not heard that and have seen many white structures work.

I do suggest that any pvc be roughed up (sand paper , or wire brush etc.) to enhance the ability of microorganisms to attach easily.

See these archives for structure that works. Here.

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92463#Post92463

Structure pics compliments of the guys from FISHIDING. Take a close look at what is going on in the pics.


























Last edited by ewest; 06/25/15 10:17 AM.