I wouldn't use ceramic tile unless it's white, and really wouldn't use it, glazes carry lead, dark glazes carry other poisonous minerals that the water will gradually release via CO2 from fish. Also avoid concrete. I use milk crates, with a piece of good flagstone on top. small fish can hide in the crates and they don't leach chemicals.
I don't think they would allow ceramic tile in every concrete and gunite pool in america to have ceramic tile in it if the tile leached lead..... Nor would they be allowed in showers. while yes in the making of ceramics some of the compounds and minerals , clays and colors they use may contain lead and other compounds once it is baked its pretty much a done deal. Now there may be some real cheap tiles out there that may fall apart in time but it doesn't take an expert to know when your holding some cheap tile.
I somehow doubt you'll find to many folks out there with concrete koi ponds that would agree with that either. Concrete does leach but it does stop the Europeans are using cinder blocks at the separator wall between the ponds and the bog . Concrete underwater almost freezes in time. If it is kept constantly wet and not allowed to dry out it can last a very very very long time.
If you mean the opening on the skimmer bucket you are making, you don’t want the entire opening underwater. It will still draw surface debris over to it but won’t pull it all in, some will pile up outside the opening.
Are you cutting an opening in the bucket or are you pulling the water over the top edge of the bucket?
yes It won’t be as effective if the opening is completely underwater, in the cut out scenario. It will still draw surface debris over to it but won’t be able to pull it in.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.