I had an Eazypod only on my pond and earlier this year I had a huge spike in Ammonia, I did a 50% change three times in three consecutive days. I added decholrinator of course and the fish were fine. The high ammonia level is going to be a lot more of an issue than the water change. Unless there’s an issue with your water supply, it shouldn’t be an issue.
When I rebuilt my pond in August from 1,000 Gallons to 4,000 Gallons, only 500 gallons of the original pond water went in and zero issues.
Also in the K1 micro section in the middle, have you removed the media and cleaned it out at all? You won’t believe the amount of crap that builds up in the bottom. I now do mine every 3 months and vacuum it out.
Main pond 4000 US Gallon, 22 Koi. Oase Proficlear Premium + Bio Module, Bitron 120 w UVC, Bakki Shower, Dura 7+ ashp. Grow on tank 600 Gallons with Eazypod Automatic and 70 litre K1 biochamber.