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Forum Newbie
Group: Forum Members
Last Login: 05/07/2007 19:20:51
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i have a ph 6.5 on my tap water my pond is only 7.0 can i use crushed oyster shell to help buffer my ph reading on my pond as i have heard oyster shell as a buffering ph of up to 8.4
when will i'll ever learn
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Post #55
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OMNIX Director
Group: Administrators
Last Login: 15/04/2008 20:35:06
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As I understand it, when Oyster shell dissolves, it releases minerals. The minerals released increase the hardness of the water, but don't contribute to buffering capacity.
However, the carbonates that are released increase the Alkalinity and therefore stabilise the pH.
If you are going to use Oyster shell powder, be aware that it will make the water cloudy, initially.
You could bag up crushed Oyster shells and place them in the filter, not done it myself, but this should work.
Perhaps Marc, our resident expert, can add more help on this one.
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Post #58
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Forum Member
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Last Login: 18/04/2008 12:24:10
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| Depends on many things. Depends largely on the KH level of the mains water, and of the pond water. Pressure filters are also major culprits for creating acids, and stripping out KH. Oyster shells work well, but you need a lot of them. They won’t actually buffer the KH, but will dissolve when the water starts to turn acidic. They won’t dissolve enough to affect the KH enough to run the pH up anywhere near 8.4, and I wouldn’t want it to! Sodium Bicarb is a better way to pick up the pH, and KH level. I see no reason to run a KH any higher than 3dH (50ppm ish), as this will generally result in the pH running on the 7.5+ side, which has adverse effects on colour condition. My ideal pH would be 7.0 to 7.3 Courtesy Mike Snaden Yumekoi
Marc Loud (Pet Secure - MD)
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Post #59
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Forum Newbie
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Last Login: 05/07/2007 19:20:51
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| thanks both on your reply i got my ph up to 7.6 with with bicarb i use 1 teaspoon too every 220 gallons of water and it stablising out over the last fews days thank you very much cheers keith
when will i'll ever learn
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Post #66
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Forum Member
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Last Login: 18/04/2008 12:24:10
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| Glad to hear its Stabilising perhaps you could post some pics of your pond in the pond section to start that forum off. Marc
Marc Loud (Pet Secure - MD)
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Post #67
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Forum Newbie
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Last Login: 08/10/2007 22:26:36
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| Yes Bi carb worked for me too during the rainy season in July and August. By adding 2 tablespoons per 1000 gals I got mine upto 7.4 from 6.5 over a few weeks.
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Post #100
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Forum Newbie
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Last Login: 27/11/2007 20:05:55
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i had 4 ph crashes last december from 7 down to 4.5 in less than 2 days due i feel to acid rain when a local factory is belching smoke out and the wind blows my way.....so i added oyster shells that have been crushed for animal feed and since then my ph is always between 7.4 and 7.7 so happy days 
God can they eat
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Post #122
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Supreme Being
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Last Login: 13/12/2007 10:37:53
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Marc Loud (29/06/2007)
Depends on many things. Depends largely on the KH level of the mains water, and of the pond water. Pressure filters are also major culprits for creating acids, and stripping out KH. Oyster shells work well, but you need a lot of them. They won’t actually buffer the KH, but will dissolve when the water starts to turn acidic. They won’t dissolve enough to affect the KH enough to run the pH up anywhere near 8.4, and I wouldn’t want it to! Sodium Bicarb is a better way to pick up the pH, and KH level. I see no reason to run a KH any higher than 3dH (50ppm ish), as this will generally result in the pH running on the 7.5+ side, which has adverse effects on colour condition. My ideal pH would be 7.0 to 7.3 Courtesy Mike Snaden Yumekoi Hi mike my ph has dropped to 6.6 its usually about 7 ive got shells in the nexus bio chamber they havent changed one bit in the last 18 month they have been in i was going to try Plaster of paris what do you think cheers m8 Hi Marc ive replied to your post thinking it was mike getting to old for this caper.
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Post #480
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