Even though I give it a quick scrub with a long-handled brush between water changes, the algae still manages to take a strong hold overall, so I continually just go on 'topping it up' with a new water change. In the summer I mostly would top it up to the rim, but today it was just a good bucket-full.
Has anyone a tip for stripping the residue (apart from sanding, without leaving any substance that could be toxic to birds? I'm wondering about bi-carb soda or similar? If no solutions, then I'll replace it. I kind of feel the birds deserve a 'fresh' bird-bath after all these years.
Still, before long, in came the raucous Red Wattle Bird for a splash; he's not too daunted how it looks.