Indian sandstone is a popular choice for patios around Stourport-on-Severn, but its natural texture means it can attract algae and grime if left unchecked, especially in shaded or damp corners of a garden. The good news is that keeping it clean is straightforward once you understand what causes the problem. SPR Paving fits a lot of sandstone patios and sees the same issues crop up again and again.
Why green algae shows up in the first place
Green staining is algae growth, and it thrives on damp, shaded stone that doesn't get much direct sun or airflow. Riverside towns like Stourport, with higher general humidity and gardens backing onto trees or fences, are more prone to it than an exposed, sunny plot. Overhanging plants, guttering that drips onto the same spot, and poor drainage that leaves puddles sitting on the surface all make it worse, because algae needs moisture to establish.
It's also worth remembering that sandstone is naturally porous, which is part of what gives it that soft, textured look, but it also means the surface holds onto moisture longer than a denser material like granite or porcelain would. That's not a fault with the stone, it's simply how it behaves, and understanding it helps set realistic expectations about how often it will need attention compared with lower-maintenance alternatives.
Practical steps that actually help
Regular sweeping to clear leaves and organic debris stops it building up into a food source for algae, and an occasional wash with a proprietary patio cleaner or diluted sodium hypochlorite solution keeps growth from taking hold. A stiff outdoor brush and warm water deals with light staining without needing chemicals at all. For a more lasting fix, a breathable sealant applied to clean, dry sandstone reduces water absorption and makes the surface easier to keep clean, though it needs reapplying every few years depending on wear.
Cutting back overhanging branches and checking that the patio was laid with a proper fall so water runs off rather than sitting also makes a real difference. If drainage was poor from the outset, no amount of cleaning will fully solve it, which is why getting the groundwork right when the patio is first laid matters as much as the maintenance afterwards.
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