Male cats seem to have more of a problem with the crystals than females do. Checking the ash content of the food is really important. You will find it on the label. Our male cat could not have ANY dry food and I had to really watch the labels of the wet food. At the adoption center where I volunteer, we use only chicken & rice wet food and try to avoid beef since it is more difficult to digest. A friend had to crate their cat when they were out of the house because he was expressing his displeasure at their absence by peeing everywhere. They made sure he did not have a UTI first, which he did not. They found all the spots with a black light - had to throw out several rugs and rip up carpet. End of the story is that at the end of three months the kitty had stopped the "bad peeing" and all is well. Your kitty is telling you the only way he/she can. They are so smart. I would start with an immediate vet visit and an inspection of your food to rule out high ash content. Good luck.