We did a part water change and de-sludge a couple of weeks ago, bought new plants, grasses and oxygenation plants, but the water went green, so no dead matter to biodegrade. Having said that the filter we have now is on it's last legs, UV broken etc, hence the new Blagdon Clean Pond Machine 10000 with UV. Our pond is only 8ft x 5ft and 2.5ft deep in places.a filter is not going to solve your green water issue; algae is too fine to be caught that way. You need lots and lots of plants to outcompete the algae, PLUS, a good sized biofilter. A bog is what many of us use as there's a lot of surface area for the nitrogen cycle. It'll also work wonders when you do get fish.
If you don't have fish, I'd wonder at how much organics you have that are decaying enough to give you such green water. Algae on submerged surfaces is what you want, but the free floating kind feeds off DOCs.
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