I made a simple light shade today to help reduce algae growth at the screens slot. My spray bar is made from 25mm pipe so I used 40mm ABS pipe cut to length then cut a 6mm slot along it's full length (i used a plunge saw for this) I then replaced the medium sized tie wraps with smaller ones and used the nodule ends where the end of the tie wraps feed into as spacers to make sure one side of the light shield dose not touch the screen. The first 10mm of the screen is now shaded by the light shade. Simple cheap and quite easy to do.
I did a mod to my light shield mod. I drilled two small holes in the light shade pipe and after making sure the slot was centralised to the screen drilled trough them into the spray bar pipe. The holes were made just the right size to push (not screw) 2 small plastic bolts through. This ensures that when I refit the screen and light shield the slot in it is perfectly aligned so one side does not lean over and touch the screen which might cause water distribution and channelling.
