I already had a boulder 80cm, and the wood-patterned box was also convenient, so I bought the boulder deep, which has a deeper depth this time. The boulder is 30cm deep, and the boulder deep is 40cm deep. I thought that was the only difference, so I also bought the railing in front this time and assembled it. Then, when I tried to attach the railing, I thought, “Hmm? It's shorter in width - about 4cm shorter - so I measured the width size. The boulder is 80cm, and the boulder deep is 84cm. When I immediately contacted them, I was told that they were not compatible. Is it necessary to change the width just because it is deeper? I went back to the store to return the item. A man who looked like an employee checked it out and said that the store didn't handle it, but that there were fences for deep pools on the internet. Of course, I ordered it and went to pick it up a few days later when I was told it had arrived. was only 30cm deep, and the shop assistant who recommended it to me said that it wouldn't fit because it was too wide, so there was a gap that looked ugly, and it was also 10cm shallower. There were also no deep-type ones available.