In the spring of March, all orders from Tongrui were shipped as scheduled, such as the plate and frame filter press from Jilin Zhongyan Polymer Materials Company, the transformer oil double vacuum filter press from Jilin Weilun Construction Company, the special CT4 small filter refueling machine from Chongqing Fengxu, and the plate filter oil press from Qilian Shanshui Electric Development Co., Ltd., all of which were successfully delivered to the customer's location according to their requirements. Chongqing Tongrui Filter Equipment Manufacturing Co., Ltd., based on its own situation, has cooperated with sales to deliver batches of oil filters as scheduled.

The development of oil filters in Chongqing can be seen as a microcosm of the development of internal oil filters, as Chongqing is a production base for internal oil filters. Small factories in other places are still sourcing goods in Chongqing, or using the manufacturing experience of previous Chongqing oil filters, while Chongqing is already at the forefront.

The sales market for internal oil filters is mainly dominated by mid to low end oil filters, as there is a lack of effective industry entry barriers for the oil filter industry. The relevant industry regulations and technical standards only include the JB/T 5285-2008 vacuum oil purifier standard. So much so that many regions are now experiencing a surge in low-end, shoddy oil filter companies, seizing the market with low prices and low-quality products, making it difficult for equipment manufacturers to truly excel. So much so that now many customers, after being deceived, would rather spend more money to go to the factory to confirm and inspect the goods before purchasing equipment. Enterprises that prioritize quality often face significant challenges. However, our Tongrui Filter still refuses to give up and strives to improve the automation of the oil filter machine by following the mainstream factories in the market. Nowadays, many products are mostly fully automatic oil filters programmed with PLC, supplied to high demand and high standard enterprises. Despite this, our internal oil filters are still lagging behind Germany, Switzerland, the United States, and other countries. We still have a big gap with the world's good level.