Confused here. I have a branded Aladdin E-Z Scoop. Description on Amazon where i bought it says it holds 1 lb of DE. Though written on bottom of scoop it says use a scoop for every 5sq ft of filter area. This leads me to believe it actually holds 1/2 a pound. I’ve searched the web and I’ve seen people saying both. So what is the true answer? I just installed new grids and am stuck on how many scoops to add! Thanks.