We have been trialing our Adsorption Sacks against alternatives on the market and here are a few things to consider when choosing your sacks (and knowing when to sack it off!)...
Not all liners are the same. Every sack we trialed had a different liner, predominantly felt, woven and non woven polypropylene, 'punched' and 'peanut' materials. Most drained relatively fast but retained minimal solid, some drained slow, retaining more solids and others were blinded by the solids leaving them full of water and not draining at all. Our sacks allow the fast flow of effluent while retaining the solids and the TSS of the outflow water speaks for itself.
Filtering, Absorbing and Adsorbing are not the same. Most sacks on the market are essentially a builders sacks with a felt liner sewn in. We found these to be the least effective, allowing fast flow but retaining the least solids. Absorbing liners were extremely effective in retaining solids but quickly became 'blinded' and no longer allowed water to flow through as Absorption allows solids to be absorbed by the liner (and stay there). Adsorption enables solids to simply attach to the surface of the liner, eventually becoming heavy enough to drop into the sack leaving the liner clear to continue filtering. Our Adsorption sacks were most effective and proved the longest lasting.
In conclusion, most 'filtration' sacks are a type of 'builders sacks' with a liner for filtration but they don't all give the same results. If you want the most effective sack, give us a call.
And just incase you need further convincing, here's our sack in action:
Available to purchase in our shop now or give us a call on 01889 508944