If you are co-washing, a conditioner containing ETDA will help with the mineral deposits.
I live in a hard water area, and I have found that using V05 Vanilla Mint Tea as a co-wash is a tremendous help. However, it's the Apple Cider Vinegar rinses (1/4 cup ACV to 2 quarts distilled water) as my final rinse that has made the most difference. Also, there is a shower head filter that won't damage your landlord's property AND you can take it with you once you move.
Hard water doesn't have to be a bummer if you know how to counteract the effects.
CG Journey Start Date: 08.21.12 Now modified CG
F/M texture, Med Density, Low/Normal Porosity, Hennindigo
Current Routine (Still working out the kinks):
Sulfate wash: CHSTS
CO-Wash: IEC, VO5VMT, TNRV
Rinse Out: YTCarrots, DLOO, Renpure Red, GVPCBLI: YTCarrots, CCC
PT: NPF Styler: AG:RC, KCCC, LALNC, FSG