Q: - How to avoid clogging pumps e.g. Epson R1800?

Understanding the problem: 

Easy solutions for difficult or huge problems can be found often in small adjustments but first you need to understand the problem. You already have accepted (you should)  that water based pigment inks dry faster as any other type of ink. You also understand, most printer designs can create additional bottlenecks to avoid the flow of the ink smoothly.

Many printer operators may start cleaning cycles because of the reduced performance of a print head ending in frustration when it get even worse because the problem may lay in the design of the printer and not in the ink or print head at all. Remember that the FabricFast Ultra is designed for Piezo technology and therefore a clogging head should be very rare but not impossible.

No, we do not want to redesign or to modify every printer type to suite the inks but small adjustments can have a great affect and improve the performance especial for those components of printers who may not have being designed for heavy duty purposes.