Following a discussion down the beach about F*%$king pumps, I though about this post, I've been meaning to make it for ages. I've never had an issue with a pump, probably because I clean them when I can feel them starting to jam up. Seems to me its impossible to keep sand out of them and in the end they are disposable (and recyclable).
The Blue pump is a Cabrinha from approx 2013/14, still works well, I've cleaned it and re lubed it approx 5-6 times. The inside of the pump body is scored from sand but with enough lube it still seals against the piston and pumps a kite to full pressure.
The white pump is the new Ozone pump, which looks like most of the new brands have now. It pumps much faster and with less friction, and is about 10% bigger in volume.
All the pumps I've seen and opened up to look inside had most of the lube pit in them when they were new, pooled in the bottom of the pump. I recommend that if you buy a new pump, before you use it, open it up and use a steel ruler or something to collect all that lube at the bottom and spread it all over the cylinder and the piston and the shaft of the pump between the lid and the piston. Anytime your pump feels dry, grinding or makes any weird noises other than sounding like an asthmatic chain smoker, pull the lid off, pull the piston out, clean with a rag (old t-shirts work well) or newspaper, then apply a liberal finger full of vaseline to the inside of the cylinder, all around the black seal on the piston, and on the shaft between the lid and piston. Clean the seal on the inside of the lid too, the handle screws off so it can be removed.
Good advice on the new Ozone pump
Differences in size. The new pumps definitely pump faster and with less effort, the design inside is different to all the older style pumps.
The piston from the blue pump, I had cleaned it last summer and it has pumped a lot of kites since then, but the lube was contaminated with lots of sand and I'm careful with my pump! Took a few minutes to wipe it clean with an old t-shirt and put some vasso on it, good as new again.
Quite a lot of scoring evident on the inside of the pump, balls of lube and sand on the bottom.
Inside of a near new Ozone pump, most of the factory lube is on the bottom of the pump.
Remove the cover plate and clean this seal everytime you clean the pump.