Great white sharks. Trophic Pyramid Information that is in video: An ecological pyramid (also trophic pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or biomass productivity at each trophic level in a given ecosystem.
The risk is that you may not be able to remove all the acid and if it is left on the metal it will continue to corrode the metal. So to give you a quick answer, you can use vinegar to etch the aluminum, but you have to rinse the surface thoroughly to remove all the acid residue.
If it is a really thick hard limescale, you may want to use a commercial product like CLR or LimeAway to remove it. If it is not as bad, you can safely use a mild acid like lemon juice or vinegar. NO! specifically on the CLR label it says not to use on aluminum, copper or brass.ead is not legal to be used for any pipe anymore. If performing a repair on a waste line lead and copper can be joined by a ru â¦ bber coupling with steel clamping sleeve.   Lead pipe CAN BE USED on acid waste systems and on existing waste, vent.