DSC00282

DSC00282

Observation - DSC00282. Description: Constant problem with algae? in our small garden pond. Bottom of pond is completely covered in green stuff, a lot of which floats to the surface, particularly when it is warm. When taken out of pond (see picture no.2) it is just like a load of green sl

Constant problem with algae? in our small garden pond. Bottom of pond is completely covered in green stuff, a lot of which floats to the surface, particularly when it is warm. When taken out of pond (see picture no.2) it is just like a load of green slimy jelly (no shape or strands like blanket weed). Constantly skimming it off the top but it soon returns. Completely emptied pond in spring and within 3 months or so stuff appeared. We've had this pond for 30 years and never had this problem. Any idea what it is and what we can do to get rid of it.