| Redhotkoi,
There are 3 types of flexlines, white, black, & brown. I suggest that you go with the brown. It is more expensive, however it is a little more rigid. It is a heavier schedule, and there is a special primer and glue that you need to use for that pipe.
All penetrations into the pond should be rigid schedule 40. Good looking pond. You may want to contact Kirin Koi. You have the ideal situation for polyurea. I believe he is in your area.
Jeff Dunkel
Aquatic Coatings |