Cedar Tub Direct has a great selection on pool and hot tub chemicals such as Spa Clear.
Spa Water Clarifier, Clear Up Your Hot Tub Water
SPA-500 Pre-Drain Spa Scrub
Spa Clear (Clarifier and Flocculant) – Canadian Spa UK
HTH Spa 86121 Clarifier, Concentrated Spa & Hot Tub
Impresa Hot Tub Water Clarifier - 16 oz
ADIOS! Hot Tub Hard Water Calcium Remover with Scale
SPA-500 Pre-Drain Spa Scrub
Hot Tub Things Spa Clarifier - Eliminate Cloudy Water
Spa Clear (500ML) Prairie Side Spas
ADIOS! Hot Tub Hard Water Calcium Remover with Scale
hth Spa 86216 Defoamer Spa and Hot Tub Clarifier, 16
Bio Ouster 3in1 Weekly Hot Tub Cleaner, Conditioner
Clorox Pool & Spa 32oz Super Water Clarifier : Target
Ouster 3-in-1 Weekly Care - Cleaner, Conditioner & Clarifier
SPA-500 Pre-Drain Spa Scrub