Mz. Bahrami,

Sodium silicate has problems with dissolution. I would suggest that you dissolve the sodium silicate in distilled water first, and then add Hoagland's solution to the solution you have made. This is the way we have found to avoid unwanted precipitation.

Good luck!

Joseph R. Chidiac made a good suggestion. In addition, I suggest that you add sodium silicate first, then adjust the pH to the desired temperature using the appropriate HCl, then add the macro- and micronutrient for Hoagland's solution.

Kind regards

this is common problem if you store it in a fridge. There seems nothing to worry about it. Just heat it up!