The pelagic zone includes those waters further from the land, basically the open ocean. The pelagic zone is generally cold though it is hard to give a general temperature range since, just like ponds and lakes, there is thermal stratification with a constant mixing of warm and cold ocean currents.ote: The word kai refers to the ocean and all its parts. Unlike the science point of view where the divisions of the ocean are due to the penetration of light, the Hawaiians division of the ocean depended on the life forms in the depths of the ocean.
Removing Porcelain Bathtub Stains. The most common type of bathtub to get rust stains is porcelain. Porcelain is a heavy stone-like or metal material that is very durable. Since they are so sturdy, removing porcelain bathtub stains can be as easy as using abbrasives on the rust.You can try some abrasive powders such as Comet or Ajax and a scouring pad.Just sprinkle some powder on the stain, add a little water and scrub. This will work for small rust stains that are just beginning.ince they are so sturdy, removing porcelain bathtub stains can be as easy as using abbrasives on the rust. You can try some abrasive powders such as Comet or Ajax and a scouring pad. Just sprinkle some powder on the stain, add a little water and scrub.
1 You can also wipe it down with a rag soaked in vinegar. 2  Try dipping aluminium foil in the vinegar and using it as a brush to scrub off the rust. 3  It is less abrasive than steel wool, but will still do the trick in removing the rust. Wash the rusted item with washing-up liquid rinse and carefully dry. 2  Mix about 25ml (a teaspoon is 5ml) of oxalic acid with 250ml of warm water. 3  Soak the item for approx 20 minutes or clean down the item with a cloth or brass brush. 4  Wash fully and dry the item when rust removal is finished.