Kieselsol crystalization problem

For the second time my one liter bottle of Kieselsol has “crystalized”.
This bottle never got below 50 degrees but still solid silica sediment forms.
Any way to get the silica back into solution?
Tried soaking in boiling water, didn’t work.
Perhaps adding a little phosphoric acid??
Anyone got a trick to salvage a whole new bottle?
Or should I just pitch it and go back to Biofine Clear.