koidaddy
karps house of koi
Did you get this figured out? Sound like your brother jumped the gun with being this far in and not have a filter idea down better. Just saying. I don't think any pond is plug in and play. There is always going to be something to monitor. Filters need to be flushed, water needs to be checked, leaf baskets cleaned, etc. The concrete does look nice though. I think your main problem is your pressorized system.