Retro fit aerated bottom drain. 

Next best to gravity fed bottom drain,easy to retro fit,just requires a suitable type pump

Weighted base to keep it in position on the pond bottom.

Supplied with option to use hose or rigid solvent weld pipe

• 56 mm size solvent pipe
• Hose from 50 mm,38 mm,32 mm and 25 mm internal bore
• 5 metres of 10 mm air hose
• Air hose adapter down to 4 mm included