Question: what is the difference between sun joe spx3000 and spx4000?
Answer: The biggest difference between the SPX3000 and SPX4000 is the form factor. The SPX4000 has a sort of frame around it, making it more stable than the SPX3000. Other minor differences include two detergent tanks on the SPX3000 versus one and the SPX4000 has two different pressure settings 1450 PSI and 2030 PSI.