Review on Fritz Aquatics 80243 Complete Marine by Joe Patterson

I have Fritz RPM about 4 years with lasting results. I have recommended this salt to other crafters in the past. Just bought a £55 box and it mixes up randomly. I have tested very accurate measurements of water and salt with both RODI and distilled water (both 0 TDS at neutral pH at 76°F) and additional Alk readings in the low ranges of 7.x dKH (Hanna's test + Salifert tests) obtained higher than normal specific gravity values (1.026) on the refractometer. The remaining parameters are within the normal range. I also transferred the salt to a special plastic container (which only held Fritz salt) and mixed thoroughly to prevent precipitation of minerals etc. and retested 3 times. I wrote to Fritz about this problem, but there is no answer (yet). I will also write to the seller of this item and post here if I get any replies.