Cat still has crystals after adding water to kibble

Adding water to dry kibble is a sensible first step, but if crystals are still showing up after months of doing that, it tells us the problem isn't just about hydration — the mineral and protein load of the dry food itself is likely part of the issue. Urinary problems in male cats need to be taken seriously; blockages can become life-threatening very quickly. Has your vet confirmed the crystal type — struvite or calcium oxalate? That matters a lot for what we do next.

That's really useful to know — struvite crystals are pH-dependent and form in alkaline urine, and dry food, even with added water, tends to keep urine more concentrated and often more alkaline than a purpose-formulated wet food does. The volume of water you can add to kibble is also limited compared to the moisture content of a proper wet diet. What kibble has he been on, and roughly how much water were you adding?

That explains a lot. Whiskas adult dry isn't formulated to manage urinary pH or reduce mineral load — it's a maintenance food, not a therapeutic one. And a tablespoon or two of water isn't close to the moisture level your cat would get from a wet food, which is typically 75–80% water by weight. You need a genuine dietary change, not just a top-up. For a 7-year-old male with confirmed struvite crystals and a history of recurrence, I'd move him to Royal Canin Veterinary Diet Urinary S/O wet pouches as his main diet. It's specifically formulated to dissolve struvite crystals and keep urine in the right pH range to prevent reformation. It's widely available on Amazon UK and it's the food most vets reach for in exactly this situation.

For a cat who's formed crystals once and is forming them again despite dietary intervention, long-term feeding is almost always the right call. The crystals cleared once and came back — that tells you his system has a tendency to produce them under normal dietary conditions. Royal Canin Urinary S/O is safe for long-term daily feeding; it's not a short-course treatment food. Your vet should recheck urine after 4–6 weeks to confirm the crystals have resolved, and then the goal is to keep him on it to prevent the next episode. The cost of a bag of prescription wet food is considerably less than an emergency vet visit for a blockage.

A few things that genuinely help: make sure he has multiple fresh water sources — some cats drink more from a fountain than a bowl, so a pet water fountain is worth trying if he's not a big drinker. Keep litter trays clean and plentiful so he never delays urinating. And watch for signs of straining, very small amounts of urine, or crying at the tray — those are red flags that need a vet the same day in a male cat. But the diet switch to Urinary S/O is the single biggest lever you have, and it should make a noticeable difference within a few weeks.