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
Best Sellers Rank	45,715 in Pet Supplies ( See Top 100 in Pet Supplies ) 494 in Aquarium Water Treatments
Brand	New Wave Aquaria
Brand Name	New Wave Aquaria
Country Of Origin	United Kingdom
Customer Reviews	4.9 out of 5 stars 42 Reviews
Global Trade Identification Number	04032974404016
Item Form	Powder
Item Weight	0.35 Pounds
Item form	Powder
Item weight	0.35 Pounds
Liquid Volume	100 Millilitres
Liquid volume	100 Millilitres
Manufacturer	Deepwater Aquatics Distribution
Target Species	Fish
Unit Count	100.0 gram

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

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