My bottle of FP3000 contracts too. Perhaps it is a small molecule vapor component excaping through the plastic bottle wall when it is hot during the day but then the larger atmospheric oxygen/nitrogen not being able to enter when the temp cools down such that the internal pressure is normalized.
If the above is correct, it means the current bottle is not proper for the FP3000 liquid/vapor. Perhaps a different plastic bottle is required or maybe even a glass/metal jug.
If the above is correct, it means the current bottle is not proper for the FP3000 liquid/vapor. Perhaps a different plastic bottle is required or maybe even a glass/metal jug.