pH in watergarden/fishpond

Greetings all, I have a 2200 gal backyard pond with about 20 2-3 inch comets and koi and about 1/5 plant cover. This week my pH is at 6.5 How can i get it up to a good range. Can anyone recommend a good amount of baking soda or lawn lime dust to put in the pond to fix it. Could the pH have gone down due to a berry tree dropping berries in it all month?
Thanks to all, joe
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

We collect rainwater for our pond and aquariums in the house. I think you may have too many fish in that pond. Comets get to be about 12 inches long, and koi get huge...up to 10 or more pounds.
Need a good, cheap, knowledge expanding present for a friend? http://www.animaux.net/stern/present.html
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Mon, 21 Jun 2004 00:30:26 GMT, "Tony Rivas"

Did you check the ammonia and KH? If you suspect a change from decaying matter ammonia may be present. KH stabilizes the pH and if it drops below 100ppm you may have wild swings where the pH reading can become meaningless.
Baking soda 1/3 pound per 1000 gallons. That will raise KH by 20 ppm. or about 1 degree. Baking soda is a great temporary fix.
I use about 2 cups of ground limestone (garden/lawn lime) in a sock, placed in the filter flow, to stabilize the pH at around 7.8. When the pH drops below that level the limestone begins to dissolve until the pH reaches about 7.8.
Regards,
Hal
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
baking soda is temporary, find out why the pH is dropping (is it? or is that the pH out of the tap?). make sure you get limestone, not quick lime which will push the pH up over 9 and kill the fish. INgrid

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List Manager: Puregold Goldfish List http://puregold.aquaria.net / www.drsolo.com Solve the problem, dont waste energy finding who's to blame ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Unfortunately, I receive no money, gifts, discounts or other compensation for all the damn work I do, nor for any of the endorsements or recommendations I make.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.