Re: Aquatic Plants Digest V2 #75

On Thu, 16 May 1996 03:39:03 -0400, Aquatic-Plants-Owner at actwin_com
>After replacing my gravel 6 months ago after finding out it was 
>causing my pH and hardness to rise, I haven't been able to get my pH 
>down even after bubbling CO2 into the return line from my filter.

Matt, what makes you think it's not still the gravel?   What tests
did you perform on the new gravel?   Best test is gravel+water to
just cover+muriatic acid (be VERY CAREFUL, muriatic acid dissolves
concrete!).  Bubbling indicates shells, no bubbling at all is OK.  
If you have bubbling you can dissolve out the shells with acid (good
use for more of the bottle).  I need about a cup of acid to treat 3
gallons of gravel.  It takes about a day (with hourly stirs) to get
all the shell.  Then wash a lot.   Dave

Dave Gomberg, Experimenta      San Francisco CA USA   gomberg at wcf_com