Sulfuric Acid, I have used it for decades and no problem yet. Like someone said go slow when putting in your tanks, a little goes a long way.
Always have baken soda :thumbsup: , yes the yellow box from the refrid. handy if you get any on you . One quart of sulfuric Acid last a long time. Store it in a safe place:thumbsup: . This stuff is extreemly dangerous so be carefull.
ONE thing with storage tanks use a small pump to circulate the water. I use a small pump 120 gph pump to premix 20 minutes before each feeding.
My system is automated so its not hard to do that. Also if you have outdoor resivores you can use the pump to warm up the water.
:apachecopter: FLY LOW AND SLOW , AND GROW FOR EVER.