Pinched mantle & freshwater dip

[Doug]

Clams are looking good with no sign of pinched mantle. Cant say if it was the 2nd. dip or the elimination of my iron based phosphate remover. Or both. FWIW, there was still some stringy attachments after the dip but they have since left. Makes me think the removal of the phophate product and running extra carbon has helped.

Now what to do about phosphates? I may add some later and see if that does indeed cause pinched mantle but hate to put my clams through anymore.