Should this go before or after mechanical filtration?

This is best to go after mechanical filtration. I put the rowaphos in a reactor in the final section of the sump. So in my sump the water flows from the tank, through the roller filter, the skimmer, the refugium then the reactor before being pumped through the uv and back into the tank. I know you didn’t ask but if you haven’t used this stuff before, it’s amazing, I’ve used it for years and swear by it.

ASIN	B002NQ30UQ
Batteries Included	No
Batteries required	No
Best Sellers Rank	64,377 in Pet Supplies ( See Top 100 in Pet Supplies ) 699 in Aquarium Water Treatments
Customer Reviews	4.9 4.9 out of 5 stars (42)
Date First Available	17 Nov. 2009
Item Form	Powder
Item Weight	159 g
Item model number	RW100
Number of Items	1
Product Dimensions	7.62 x 7.62 x 7.62 cm; 158.76 g
Quantity	1
Size	100ml
Volume	100 Millilitres

Rowa D-D RP-10 phos Phosphate Removal Media - 100 ml/3.3 oz

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