why some pvc lay flat hose are expensive, some are low, and where is the quality gap

The PVC lay flat hose on the market smells like gasoline kerosene, because PVC lay flat hose adds a cheap volatile plasticizer, called “solvent oil” or “No. 2 oil,” which is an extract of various waste plastics and contains various heavy metals and harmful substances.
This irritating smell can be detected at low concentrations; over a long period of time, low concentration exposure can cause headache, dizziness, fatigue, sensory impairment, decreased immunity, and may lead to drowsiness, memory loss or neurasthenia, mental depression; chronic poisoning can also cause great damage to the respiratory system; long-term exposure can lead to respiratory failure. Dysfunction and liver poisoning; liver cell damage, abnormal liver radiation ability; long-term exposure to this harmful substance of plants, will also appear rotten roots, yellow leaves, defoliation, individual bud wilt and other phenomena;