Specifications, Manuals and contact information for Pondmaster customer service can be found at this link

Hello, thank you for contacting Houzz. Please call us at 800-448-1632 so that we can assist you directly. We are available from 5am to 7pm Pacific time, Monday through Friday. Thanks so much!

Simple question,with pond pump the discription says in l line or submerged.so what does in line mean?