I bought silicone ice cube forms and when I used them something white swam on the water. I guess some silicone that dissolved from the form.
First I made ice three times and threw it away, but the problem persisted. Then I tried to put them in the dish washer. Now I bought another product from a different manufacturer and the problem is even worse.
(I am NOT 100% sure if they may still be products from the same factory or made in a similar way, but I explicitly tried to buy another product)
Are silicone forms just crap, am I doing something wrong, or is there a good way to clean them before the first use?
I do not have the problem using the same tap water with the hard plastic ice cube maker that came with my fridge. The general water quality here is quite high and I even use the water with a sodastream and making tea in the same glasses and it looks perfectly clear.
Before freezing the water looks clear as well an I do not see such dirt even when I let a glass of water stand somewhere.
Update: I made an experiment by freezing one form with and one without lid. Here is an image of the forms and the lid:
The blue one was used without lid. They seem to be both silicone and the lids are all the same, only the forms have different colors.
Left: blue form without lid (Little dirt, but still too much)
Right: white form with lid (Larges flakes of some dirt)
The cubes in the open form were quite easy to remove and well-separated. The lid stuck a bit on the cubes and I needed to break the cubes apart by bending the silicone, because the lid hold the water surface flat.
The open form stood on the closed one.
Update 2: Boiled water has the same problem. I'll try a water filter next.
Update 3: Water hardness as published by my water supplier:
- Hardness 4,7 – 8,1 °dH (soft)
- Magnesium 5,2 – 9,0 mg/l
- Calcium 24,6 – 43,5 mg/l
- Natrium 11,3 – 21,9 mg/l 200 mg/l
- Chlorid 23 - 39 mg/l 250 mg/l
- Nitrat 10 - 21 mg/l 50 mg/l
- Uran < 0,0002 mg/l 0,01 mg/l
Update 4: Same result with the water in another city (unknown hardness). In some of the forms white sediments after the water rest dried. Next I try a water filter.
I tried a water filter and got the same result.
Using a water filter I still get white flakes like in the right glass after melting all 24 ice cubes of the new form (not the one pictured above, but also silicone) with lid.