You must have gotten some cross contamination of a salt, acid, or alcohol for the reaction to happen. It is a <font color=”#0066CC”>anti-flocculant. </font>Everyone uses it daily in soaps. Especially laundry soap. It’s what replaced tri sodium phosphate as a main soap base. It dissolves best with cold water. ph is 12.7 at 1% solution, so be careful.
Seems that one could put a small pump in the tank and keep water moving on it to dissolve it.
This out of the chemical book; Chemical Properties
The metasilicates are highly water soluble, but insoluble in
alcohol, acid, and salt solutions. Solutions of sodium metasilicate,
when heated or acidified, are hydrolyzed to free sodium
ions and silicic acid. In moist air, they are corrosive to metals,
including zinc, aluminum, tin, and lead, forming hydrogen
gas. They are all strong bases reacting violently with acid.
<font color=”#0066CC”>Among inorganic electrolytes, sodium
metasilicate’s active alkalinity and PH buffering index is the highest.
It has strong moistening, emulsifying and saponifying effect on fats. It
is excellent at eliminating, dispersing and suspending impurities, and
it can prevent impurities from recollecting. It has strong cleansing,
buffering and neutralizing abilities, can emulsify fats and oils, is an
anti-flocculant for inorganic matter, protects metals from erosion, can
replace sodium tripolyphosphate in producing detergents and metal
cleansing agents, thus reducing the environmental pollution of sodium
tripolyphosphate.</font>