A credit card must be kept on file for routine billing which takes place on the 1st and 15th of each month or the following business day. Upon receipt of this contract and the credit card authorization form, your service will begin. Chemicals are billed on an as-used basis. Example: $120/week + chemicals required per week. Customer chemicals can be used first if a customer wishes to provide their own. Please check the SRG website for current chemical pricing for regular service customers.