[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Where to get PO4

At 03:48 PM 12/21/01 -0500, Cheryl Yetka asked:
>I have found sources of potassium, and traces, and nitrogen is not a
>problem.  But where can I buy some PO4?

Great question.  Here are a bunch of answers:

TSP (Tri-sodium phosphate) easy to find, cheap, but use VERY SPARINGLY, it 
is a strong base and will raise your pH some.  It will raise your pH a lot 
if you overdose.

KH2SO4 and K2HSO4 are available, but a bit pricey (say $15/kg).   But that 
is a lifetime supply for the whole North American continent.

Schultz African Violet food (cheap, $3.50).  It is 5-14-14 or some such, a 
great phosphate source.  And a convenient liquid.  This is what I use.

Careful, when dosing PO4 if the Fe level is high, you will form a 
precipitate and lose all the Fe from your water column.   So  dose Fe one 
day and PO4 the next.   And you shouldn't need to dose PO4 more than once a 
week unless you have a VERY fast growing tank and few fish.

Dave Gomberg, San Francisco       gomberg at wcf dot com
http://www.wcf.com/co2iron for low cost CO2 systems that work!