Sounds like you're creating a copper mine. I hope you don't have long term plans for your pond? Keep up that rate of treatment, you'll never have a diatom, phytoplankton or zooplankton.
I have issues with Filamentous algae along the shorelines and 3 times a year I physically remove it and take it 200 yards away to the garden. I see a 10-15% reduction annually. I am sure I'll hit the law of diminishing returns relatively soon.
You may want to look into, sodium carbonate peroxyhydrate (SCP) and limiting phosphorous, which is ridiculously difficult. The USGA has developed some filtration for wastewater but I have never looked into consumer uses. SCP requires higher levels for coontail but is highly effective against algae and has less long term effects.
I have never used and have only casually researched it. Curious if anyone has?
https://pubmed.ncbi.nlm.nih.gov/27322608/https://dnr.wi.gov/lakes/plants/factsheets/SodiumCarbonatePeroxyhdrateFactsheet.pdf
