Broad Spectrum had already been used on three different treatments before I got on the scene without any apparent benefit so I would think that it is...
I would definitely have done a PP treatment early if it were my pond, but this is probably beyond the ability of this pond owner and the fish are in...
bigger is usually always better but dismantling everything to add 2' may not be worth the stretch...maybe revisit the design.
if it has to be inside...
