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tmz · 05/07/2017, 11:29 AM

Calcium carbonate/CaCo3 would precipitate and heat will reduce the amount of calcium and carbonate that can remain in solution. However, the OP isn't dosing any calcium/Ca to the top off reservoir.
There are solubility limits for carbonate / bicarbonate aside from precipitation. I suspect the powder at the bottom is undissolved carbonate /bicarbonate.

Alkalinity is not a single thing it is a measure of things that neutralize acid including: CO3 ,CHO3( carbonate/ bicarbonate), PO4/HPO4, borate ,oxide ,silicone,magenesium hydroxide. In seawater and aquarium salt water roughly 96.5% of the alkainity is carbonate/bicarbonate a measure of which is typically used as a measure of alkalinity.

05/07/2017, 11:29 AM	#10
tmz ReefKeeping Mag staff Join Date: Apr 2006 Location: West Seneca NY Posts: 27,691	Calcium carbonate/CaCo3 would precipitate and heat will reduce the amount of calcium and carbonate that can remain in solution. However, the OP isn't dosing any calcium/Ca to the top off reservoir. There are solubility limits for carbonate / bicarbonate aside from precipitation. I suspect the powder at the bottom is undissolved carbonate /bicarbonate. Alkalinity is not a single thing it is a measure of things that neutralize acid including: CO3 ,CHO3( carbonate/ bicarbonate), PO4/HPO4, borate ,oxide ,silicone,magenesium hydroxide. In seawater and aquarium salt water roughly 96.5% of the alkainity is carbonate/bicarbonate a measure of which is typically used as a measure of alkalinity. __________________ Tom Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals. Last edited by tmz; 05/07/2017 at 11:45 AM.