If the clumps are still soft & break apart easily when pressed it should be fine. I would definitely check your ALK before adding it to the tank just to be sure it's spot on. I do heat mine as I add it to the tank immediately after mixing. Fritz recommends the water be between 70-75 degrees when mixing, so I add two lg power heads about 10,000 gph with both, set the temp controller for heaters to 75. when at temp I add my salt, let it mix till clear,check salinity if good check ALK if good add to the tank.