The bulk insulation structure can be dried out with our without the core.
The bulk insulation may not get dried out well by this method unless the tank is kept hot.
In the above, what kind kind of insulation is “bulk insulation”? Thank you for your help.
Erklärung: There are many heat-trapping materials that belong to this category of insulation.
Ref:
Bulk insulation works by trapping pockets of still air between its fibres, retarding the transfer of heat. ... Through retarding the transfer of heat, insulation can make a significant impact on the level of comfort in your home all year round by reducing the amount of warmth escaping during winter and keeping out the heat during summer. Examples of Bulk insulation products that are commonly used include Glasswool, Polyester, Rockwool, Wool blend, loose fill insulation and polystyrene....
The translation workplace 
Zustimmung (Netto): +4