Filter sock or filter wool is considered ur mechanical filtration. It will catch physical dirty / debris. & once it is dirty its needs to be replaced or washed. So its normally used in the 1st stage of filtration in the sump.
If you don't use it all the dirt will get into ur biological filtration which is bio media. it will rot & increase your nitrate levels
Hi all bro ..sorry i was driving grab and too many txt came in I try my best to reply already...so here update what left. 5)red leather ($10) 8)neon green candy,was only 2 head when I get it..now 5 heads n a baby 10)big red monti and small green monti ($20) 11) 1 rock with alot of golden clove ($50) 12)gru with head full of neon green gsp still growing($50) 13)Gsp on rock ($30) 14) GSP almost half palm size ($20) 15) gsp 50 cents size ($10) Sent from Singapore Reef Club mobile app