Raising alk with baking soda

Saltfun2003 · 01/12/2010, 03:46 PM

My alk is currently at 6.4 want to raise it to about 9. Using this calculator http://reef.diesyst.com/cf/chemcalccf.html it says i need 20.3 tsp to raise it up. Does this seem about right total water volume is around 300g. How should i go about adding the baking soda? I was thinking about adding to to my ro topoff which is 20gal tank then mixing in the baking soda the 20g of ro water is gone in about 5 days. Would this be slow enough or should i do it in two batchs?

bertoni · 01/12/2010, 03:52 PM

That amount sounds reasonable, but I'd try using two doses unless I was very sure of the actual water volume. Just dissolve in some RO/DI water, as much as it takes. Adding via topoff water is fine if the dose gets added within 24 hours or so. Alkalinity can drop 2 dKH in a day fairly easily.

01/12/2010, 03:46 PM	#1
Saltfun2003 Registered Member Join Date: May 2004 Location: Valrico, FL Posts: 189	Raising alk with baking soda My alk is currently at 6.4 want to raise it to about 9. Using this calculator http://reef.diesyst.com/cf/chemcalccf.html it says i need 20.3 tsp to raise it up. Does this seem about right total water volume is around 300g. How should i go about adding the baking soda? I was thinking about adding to to my ro topoff which is 20gal tank then mixing in the baking soda the 20g of ro water is gone in about 5 days. Would this be slow enough or should i do it in two batchs? Last edited by Saltfun2003; 01/12/2010 at 04:12 PM.

01/12/2010, 03:52 PM	#2
bertoni RC Mod Join Date: Mar 2002 Location: Mountain View, CA, USA Posts: 68,814	That amount sounds reasonable, but I'd try using two doses unless I was very sure of the actual water volume. Just dissolve in some RO/DI water, as much as it takes. Adding via topoff water is fine if the dose gets added within 24 hours or so. Alkalinity can drop 2 dKH in a day fairly easily. __________________ Jonathan Bertoni