Whatever the lemon scent is, it won't be organic. Chlorine bleach disintegrates organics, that's how it works. And if you're doing the acid bath to get rid of phosphates, then you'll actually need to lose a significant amount of mass to be successful. It works by removing a layer of rock that has adsorbed phosphates, if you don't remove enough then you're not removing phosphates. Depending on the porosity of the rock, I've heard of acid baths removing 25% of the dry mass of the rock.
Carbon will probably help with removing whatever the lemon scent chemical is. Also soaking in RODI will pull it into the water for removal
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