So I'm replacing four hydor 1500's with two wp40s. I have the four hydor wired to a plc and i wrote a time based program. I had different patterns consisting of any four alternating continuously or pulsing but hated the constant clicking of the propellers. So it was my bday last week and the wife said we didnt get you anything then light bulb. I ordered Monday night and will be here today. I might do a little review. I