Keep an eye on aquatic and marginal plants, removing faded flowers and yellow leaves, and cutting back where necessary.
Top up water where necessary in ponds and water features. Aerate the water in hot sticky weather by leaving fountains on overnight.
Continue to remove blanket weed and duckweed using a net or rake.
Shallow water features or those with water washing over cobbles can become green very quickly in summer weather. Eco products based on naturally-occurring micro-organisms or plant extracts may help keep the water clear.