What to do if you use the wrong potting mix or water
Using the wrong potting mix, tap water or worst of all adding fertlizer to your plant is sure fire way to eventually kill it. However, if you have done one of these then don’t panic, there are solutions!
If you’ve been watering your plant with tap water for many months and your plant is looking a little unhealthy, then it is advisable to flush the plant 4-5 times with clean water to get rid of those horrible inorganic residues which are killing your plant. Your plant should still live and re-potting shouldn’t be necessary.
If you’ve used the wrong potting mix or even used fertilizer and it’s late winter or early spring, then just repot and your plant should be fine. If it’s not late winter or early spring you will still need to repot your plant, but make sure you give your plant lots of light, keep it watered well and make sure you follow the advice here on flytrapgrowing.info as repotting at the wrong time of year is very hard on your plant. If you used a water soluble fertilizer such as potassium nitrate then you should be able to rinse it out with a good rinsing of water; fill your pot up with water and let it drain 20x or so to remove all of the fertilizer.