policy wording

our review just came back and the reviewers made the following comment: "The economic assessment policy is incomplete, as it does not require that maintenance cost savings be included in the economic assessment. Technical Advice: Please provide a revised policy that accounts for potential water supply and disposal cost savings, as well as maintenance cost savings as part of the required economic assessment of conversion to high-performance plumbing fixtures and fittings." 1. 'potential water supply and disposal cost savings' surely means 'water utility savings and sewage utility savings', which is included in the policy we submitted - or am i missing something? 2. we had submitted the policy document with an amendment which specifically amended the policy to include "potential maintenance cost savings". again: i don't understand what else we should include? before i send a clarification request to the review team, maybe one of you can help me shed some light on this? many thanks!