第一阶段产品为方型，顶部和底部略小，若是分开就是上下两个梯形。加工时先加工出来两个凹槽状的模型，再把它们合在一起，即成为一个成品。这种产品解决了传统产品不耐腐蚀，易渗漏堵塞的缺点，但是严密性还不够好，抗压性也一般，无法制作大型产品。　　第二阶段产品基本为横卧的圆柱体，但顶部和底部还是设计为平面。车轮状凹凸面封头开始使用。因为是筒状模具，这一阶段的产品一般采用对接的方法连接结合。这种产品的抗压性能要比第一阶段的好，但是产品的严密性还可以再加以改良，而且这种产品的加工程序复杂，不利于工厂化生产。　　第三阶段产品也叫手糊玻璃钢化粪池。这种产品保持了第二阶段的车轮状封头设计，筒体为圆筒状，基本上一次成型，但无层次工艺，很难同时满足制品对于强度和抗漏渗、防腐蚀的要求。　　第四阶段产品即为机械缠绕玻璃钢化粪池，这种产品筒体两端采用力学凹凸面设计制作，筒体采用机械缠绕工艺、高抗压结构设计制作，产品整体成型后抗压、抗冲击性强度以及韧性都比传统手糊玻璃钢化粪池的安全系数增加数倍，弥补了传统手糊玻璃钢化粪池、波纹型玻璃钢化粪池罐体手糊厚薄不均匀、制造粗糙等不足。 The first stage product is square, the top and bottom are slightly smaller, if separated is the top and bottom two trapezoids. When processing, two grooved models are processed and then combined together to become a finished product. This product solves the shortcomings of traditional products that are not resistant to corrosion and easy to leak, but the tightness is not good enough, and the compressibility is also general, unable to make large products. The second phase of the product is basically a horizontal cylinder, but the top and bottom are designed to be flat. The wheel has a concave convex surface to be used. Because it is a cylindrical mold, the product of this stage generally USES the joint method to connect. This product has better compression performance than the first stage, but the strict tightness of the product can be improved again, and the processing program of this product is complex and not conducive to factory production. The third stage of the product is also called the hand-paste glass steel septic tank. This product to keep the shape of the second phase of the wheel head design, cylinder to cylinder, basic last forming, but there is no hierarchy process, it is difficult to meet at the same time products to the requirement of strength and leakage seepage resistance, corrosion resistance. The fourth stage of the product is the mechanical winding FRP septic tank, this product is the concave and convex surface mechanics design on both ends of the cylinder, and high pressure cylinder adopts mechanical winding technology structure design and production, after molding, products overall compressive strength, impact resistance, strength and toughness are better than the traditional hand lay-up FRP septic tank safety coefficient increases several times, make up for the traditional hand lay-up FRP septic tanks, corrugated type glass fiber reinforced plastic septic tanks tanks hand paste thickness uneven rough, manufacturing, etc.