Drs1685 Posted August 4, 2015 Share Posted August 4, 2015 Can someone tell me what the process or formula is for determining how much my calcium/alk levels will increase in a 10 gallon tank doing a 10 or 20% water change, for example if my dkh is 8 and my water change water is a 10dkh, what will my new dkh be after the water change? or with calcium say I'm at 400 and my new water is 440 how much will my calcium increase doing a 10 percent change? Link to comment
HarryPotter Posted August 4, 2015 Share Posted August 4, 2015 If you do a 10% change from 400 with 440 water, I believe the level with go up by 10% of 40 (the difference), so it'll go to 404. Link to comment
Haelstrom Posted August 5, 2015 Share Posted August 5, 2015 If my math is right for calcium. Old water=90% of volume at 400 calcium. New water=10% of volume at 440 calcium. Calcium total would be 10% of the difference in the old and new water calcium. So like Harry said it will be 404. Link to comment
Hammerstone Posted August 5, 2015 Share Posted August 5, 2015 My brain is going to explode!! :-) Link to comment
HarryPotter Posted August 5, 2015 Share Posted August 5, 2015 If my math is right for calcium. Old water=90% of volume at 400 calcium. New water=10% of volume at 440 calcium. Calcium total would be 10% of the difference in the old and new water calcium. So like Harry said it will be 404. Only thing is that in reality the results are weird... Like ill be at 420 in my 45 tank, do a 5g water change (~10%) with water at 440, and then my water tests at 440 multiple times with Salifert. Lol I don't understand where the math/reality collides, but somewhere an alien is screwing with me Link to comment
Drs1685 Posted August 5, 2015 Author Share Posted August 5, 2015 My brain is going to explode!! :-) Exactly what I was feeling trying to figure it out lol, thanks for the help guys! Link to comment
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