Shopping basket > Review order Currently in your basket Before proceeding to checkout you will need you to either login or create an account. Your items will remain in your basket. USDItem TotalBuilding the Foundation for Collection System AI - Norwalk, CT (11 words) $11.50RemoveStarvation Time VS Contact Time: The Impact of Hydraulic Retention Times on the Carbon Redirection and Biosorption Capacity of A-Stage Systems Treating Raw Domestic Wastewater (26 words) $11.50RemoveNet total: $23.00VAT: $0.00Gross total: $23.00 Payment info When you click the checkout button, you will be redirected to a secure Paypal page where you can either pay using an existing Paypal account, or pay by card without a Paypal account. Continue shopping We access Visa, Mastercard, Maestro, American Express all through Paypal.