Pond sunscreen. Blocks UV rays and prevents cloudiness in the pond. Amber-colored, crystal-clear water through natural humic substances. Reduces stress for all pond inhabitants and is ideal for preventing algae. Strong sunlight in garden ponds without natural shading can lead to serious problems. Sera pond bio humin provides a solution through targeted light filtration. The aggressive UV radiation is reduced to a tolerable level, effectively preventing algae growth. Additionally, fish floating on the surface are protected from painful sunburn. Sera pond bio humin ensures amber-colored, crystal-clear water and less stress for all pond inhabitants through natural humic substances.