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Hypochlorite would prevent algae forming I suspect but it isn’t good for the feline.
Are there any cat friendly alternatives?
TGR-
With hypochlorite it's a function of contact time and concentration of the hypo.
I suspect you are unable to kill off the deeper embedded algae, which then finds a protective surface free of any other life forms. -
There used to be an industrial biocide, Tego51, that was preferred by Catteries, as it was cat-compatible.
As far as I know the company that sold Tego51 has been sold at least twice since I knew them. Maybe check the Diversey UK website to see if it is still available or has been superceded.
mespilus
Cementitious paving slabs are cheap.
They have a myriad of tiny surface hollows, which form a great habitat for algae.
You might be able to prevent re-growth with severe power washing followed by
applications of a sealer. Any sealer readily available through B&Q or equivalents,
is likely to give a pretty thin coating, densely trafficked areas will soon wear through.