With this little Sensor you can detect if your ballast pump got infected with ballast flora.
You can build it in the fabricator, place it near your ballast pump and connect it to... whatever you want. It has a Signal_Out output which sends any number to a light for example (actually its not just a "1" but a ever altering number as soon as the infection starts. But any number other then 0 will be interpreted as "1" for a light, so it should be fine.)
Technically, for those interested, it is a junction box (because the motion sensor dont detect ballast flora and junction boxes can get infected) which wont be damaged from water, so you dont have to repair it. I disabled all in and outputs but this one, so you cant use it as a junction box, just as a... ballast flora detector ;) Because it is a junction box i didnt manage to get it just send a "1", sorry. I am working on it. Oh, and better to place it really close to the ballast pump so it gets imidiatly infected.
Have fun, and dont be shy to give a thumbs up if you like my work.