Posted: 18/09/2013 at 16:36
Sara if you want to stop it becoming stagnant dig a bog garden out for excess rainwater to run in to.
I did this on mine and it worked brilliantly. I had no filters, pumps or anything. I just dug a shallow basin like hole about 3/4 ft in diameter put pond liner in the bottom with a few holes, planted it with marginal plants and topped it with gravel. I made sure my pond dipped slightly in that direction and did a sort of pebbly beech effect. Made steps there into the pond to put some big stones on and plants could sit on the ledges too. Worked out great for frogs etc. as the could easily get in and out and they also used that area to spawn as the fish didn't like to go into the shallows around there.
Hope that makes sense