Ponds and lakes are often threatened by excessive nutrients entering through lawn and garden run-off, septic tank seepage or agricultural run-off. If left unattended, excessive nutrients support the dynamic growth of aquatic algae, interfering with intended water uses and sometimes presenting health hazards to humans and animals. Choose from a range of effective products to both control and prevent excessive algae growth. Also consider aeration, circulators or fountains and sediment removal as additional preventatives. Call 0800 PARKLINK or submit details here if you are unsure what you need.