I've never used an algae scrubber.
But my ARID E18 reduced my PO4 levels from 0.08 to 0.00 in 11 days.
ARID E18 Phosphate Control.
Just opened that thread to look at the pictures and that thing looks massive! I'll actually have a read now.
My ATS has only been up for 3 weeks now and I will already swear by them and recommend them.
I have a pretty bad nutrient problem so my algae growth has really taken off. And I have seen a very significant decrease in algae in just the last 3 weeks.
I did a lot of reading about scrubbers before I decided to build one and basically it's just like growing macro algae in a fuge, except the macro is on steroids. Kind of comparable to the algae reactor posted above, but IMO still just a bit more effective.
Read the guide on how to size, light and get the correct flow for a scrubber which is found in the algae turf scrubber basics thread. Then you can correctly size an ATS for your system so it can really kick ***.
Just a note: you don't need to have an ATS in a box for it to work well, I just prefer to keep the light contained as my stand is currently open.
Building the DIY box
Finished box over the sump
Screen after 5 days (first cleaning)
Screen after 14 days (second cleaning)
An example of some of my rocks from 4 weeks ago (left) and this week (right). A lot of snails were added 2 months ago but until the ATS was added the algae would grow faster than the snails could eat it. I was pulling out 2 cups of algae and it would be back in less than a week, even with the snails. Now the snails can eat the algae and it doesn't grow back thanks to the ATS.