After we fought for six months on our garden pond, especially the algae were not Lord, there came a complete treatment: Algae what was possible sucked, scrubbed, rausgekeschert sucked mud as possible Aqua Active Biokick fresh in the pond Next day remaining algae with Aqua Activ Algo Direct fights, removes dead algae with the Nets applied after two more days Aqua Active Algo Universal. Since then (about 1 month) crystal clear water, no algae, all the best. Next spring we will the pond in any case immediately after the basic cleaning (which is through the suction and refilling usually comes at a partial water exchange, vaccinated with Biokick.
Postscript: no water plants and none of our pond inhabitants has taken in this treatment somehow damage