Sea-Lab #28 Automatic Replenisher 2 lbs box
"     Automatically controls concentrations of 28 elements including calcium, strontium and all 15 essential trace elements. Removes heavy metals and limits ammonia and phosphate while helping to buffer aquarium pH.  Available in: 1/2 lb Container (as pictured)  The 1 kg. block treats over 100 gallons. Block box contains 24 Blocks (2 LBS)  Saltwater use only.   This Auction is for the 2Lb box. Please see our other auctions for other sizes.  "