The word desalting is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (49 words)
aiglets, aligned, anglist, dangles, dealign, dealing, delints, denials, dentals, dentils, destain, details, detains, dilates, elastin, elating, entails, gelatin, genials, genital, glinted, glisten, instead, ladings, lasting, leading, leasing, ligands, ligated, ligates, nailset, sainted, salient, salting, sealing, seating, singled, singlet, slanged, slanted, slating, snailed, stained, tagline, tangled, tangles, teasing, tingled, tingles