Katcha Pond Protectors Are The Perfect Solution To Keep Cats & Herons Away From Your Pondfish. Piece Together The 10 Parts To Cover A 1 Square Metre (10.7 Square Foot) Area Of Your Pond. If Your Pond Is Larger Simply Get Multiple Packs & They All Slot Together Easily.slim Pieces Do Not Jar The Look Of Your Pond. They Keep Your Pond Fully Safe From Opportunist Cats & Herons Allowing You, & Not The Local Wildlife, To Enjoy Your Pondfishenjoy The Leaf-catching Ability Of Pond Katchas, Keeping Organic Matter From Rotting In Your Pond & Elevating Nitrate Levels.