For best results, it is recommended that deionized or soft water be used in order to insure optimum stability. Either cool or warm water may be used with moderate agitation. It is recommended that use directions are worded in such a manner that about 0.1% of fabric softener, based on fabric weight, is applied in the last rinse of the washing machine cycle. For example: If a 10% sol'n. of "Carsosoft" S-90-M is prepared, 1 fl. oz. per average wash load should be used.