Concrete ponds are the strongest type of pond. If you get the construction right first time your pond will last for many years. Concrete ponds are strong enough to support any design or shape and being so strong means there is no restriction on suitable sites in your garden. Building a concrete pond in your garden will take some time – pond foundations must be reinforced and the final layer of render should include reinforcement fibres and be sealed with G4 Concrete Pond Sealant.