Green water!

[algeredge]

Seem to remember seeing something in the free Equi mag from the saddlers about a green plastic thing that you could buy to put in outdoor water troughs to slow down the green algae stuff from growing. Cant find anything out about them now and thre the mag away! Anyone any idea what it was I saw???
Thanks

 

[CastleMouse]

I saw it mentioned in Your Horse... I'll try and find out!