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Our pond is roughly 6,000 gallons (23,000 litres) and the lithaqua is only a small part of our total filtration at 100 lb (25 kg). It is incorporated into trays with lava rock, which as I said we plan to replace with feather rock to improve performance and reduce weight.
In our experience Lithaqua does not raise kh in the pond enough to notice. What it does to is stabilize the kh within the filter itself, which is where most of the acids are produced by bacterial action and in my opinion that is one of its greatest assets in a filtration system as it promotes a stable and healthy environment for the bacterial colony.
BH should work reasonably well in a TT application, but I've not used it so I'll leave it to others to speak specifically to that issue. Our turnover rate in the pond is about 1 1/2 times per hr, with roughly 1/2 going through the showers and the other half in submerged media.
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Larry Iles
Oklahoma
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