Section Env-Ws 374.07 - Safety Criteria for Chemical Additive(s) Proposal(a) Safety criteria shall be as specified in this section.(b) Treatment systems that add a chemical on a continuous basis shall have at least 2 of the methods identified in (c), below, to prevent a chemical overfeed.(c) The following methods to prevent chemical overfeed shall be acceptable: (1) Connection of the electrical circuit of the chemical feed pump to the electrical circuit of the main water pump;(2) Installation of a flow-measuring device with a common disconnect interfaced to the circuit powering the chemical feed pump;(3) Installation of a continuous-reading analytical device for that particular chemical feed with a disconnect interfaced to the chemical feed pump; or(4) Any other method for which there is an industry standard.N.H. Admin. Code § Env-Ws 374.07