Did you know that Soda Crystals are actually a 'wet' product? It's a physical characteristic that at above 32oC, they start to 'melt'. As their temperature drops, they will set solid. In the UK, this doesn't usually present too much of a problem as temperatures rarely reach, or stay at, those temperatures. Some people may think that they have somehow got wet, but that isn't the issue.
Obviously we don't produce Soda Crystals if temperatures are that high and we (and retailers) do everything possible to ensure that they don't reach those temperatures. Although we occasionally get reports of bags that have gone partially lumpy, or set solid, it's usually how they've been stored after leaving the store; after all, you'd know if they had set solid when you pick them up off the shelf. If there are some small lumps, they can usually just be squeezed and they will break up.
Our advice is to keep them away from high temperatures:
- On warm days, don't leave them in your shopping bags for extended periods in the boot of your car
- Keep them in a cool dry place and away from bright lights. Don't store them in airing cupboards, sheds or porches and never leave them out on window ledges
- If storing under the kitchen sink, keep them away from hot water pipes or any hot appliances such as ovens or washing machines.
Store Soda Crystals below 25 deg C
What to do if they HAVE gone hard
If there are just some lumps, they can normally be broken up with pressure. But if they have gone totally solid, like a brick, they still retain all their great cleaning and degreasing properties. We advise that you peel back the top of the bag and dip the block into warm water. It will readily dissolve and you can use the resulting solution for any suitable application. For example you could leave them to dissolve in warm water and use as your regular drain clearing maintenance.