Shockwave is a prespray and Ultimate Master is a rinse!!
Because ?
Like all these powders they are both mostly sodium carbonate and phosphate , they both have a small surfactant content ... and they both have a small solvent content . Shockwave has DPM ester as its solvent and UM has d-limonene as its solvent .
The other ingredients ... are they both suppose to have an enzyme content ? , and UM has an percarbonate content . Anything else , antifoam etc is of little relevence .
So both could be a prespray , in the care of UM you would have the solvent , surfactant , oxydizer ,enzymes all working during the dwell /agitation .
The percentage of solvent in both is pretty small , thats why you might use a dedicated prespray seperatly of combined in the mix with the powder to boost it . The concentration of the dedicated prespray would be greater .
I often prespray with UM ... but i do boost it as desired by adding citrus prespray ( d-limonene content )
and i also get an ester from mistral ( butyl glycol ) and bung it all in together for the bad stuff .