dttk
Senior Member
Feb 20, 2002, 8:08 PM
Post #2 of 2
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Hi Tan, the other alternative is cockle shells. These may be obtained FOC from any "char-koay-teow" stall. But you have to make sure that you do a good cleaning job before putting them in the filter. pH of 6.5 is too low for koi. I suggest you increase it gradually by adding baking soda (sodium bicarbonate). 100g of baking soda increases the KH of 1m3 of water by 1dKH. I suggest you add half of this amount (50g x 18m3) once a week and check pH until it increases to above 7.0 . Koi thrives between pH 7.5-8.5 . In the meantime, get the shells ready. 
Always friendly :)
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