Bacteria will grow on everything and anything. The whole idea behind bio balls over filter media is oxygenation.
Oxygenation is my main concern, that's why I want to make sure I'm selecting pads of the right
density...I have to pass on the Bio balls, I don't want to deal with media that spins around when I go to hose it down
I have had a 20000 gallon koi pond for 13 years, I'm no expert but I can just pass on what works for me. As far as bio media I have had the best luck with a more open media vs tight. It' a mess when the bio filter starts getting clogged up.i used to use rock u til I have to fight it after the first season. You have to remember bacteria grows on everything in the pond. Rocks, liner, ECT. I don' have the biggest filtration set up and I can safely feed our koi 15 pounds a week. According to all the experts my big old koi should have been dead years ago. But they ate thriving. My females are over 30in long. I even have a large mouth bass that has been in there 6 years. He is up to 18in last spring.
What you said makes sense to me, so I'm going to use all black and maybe use the green I have in my skimmer box, in addition to the black that's already there, that way I can still cut down on more solids before the water reaches the Bio
Congrats on your success as a koi keeper, I'm dying to see your koi, would you consider posting a showcase?
Interesting that you want to try this
@Gemma . I had the same thoughts and last year I used two 6” thick round pads...I pass on the bio balls, I don't want to deal with spinning media when I'm trying green Matala filters in my bio-falls. The green did not clog all season. Of course I also have mechanical filtration before going into the bio-falls. I had been wondering if I should go with a blue filter in addition to the green, but I wanted to be sure the filters did not clog so I stayed with two green.
I used the real thick white pads and lava rocks up until the renovation 2 yrs ago, the contractor introduced me to the Matala pads and this swirly media...I love the Matala pads but I literally hate this swirly media, I find particles of it everywhere!
You could try the blue, just cause it didn't work out for me, doesn't mean it won't do just fine in your setting
When I had the blue pad in my skimmer box, I had to,rinse twice a day even when the water was crystal clear, or it would slow down the flow and starve the pump
Thank you all for your reply!