The default 3 tick setting on the Arino Caprio is not strong enough for big business, but what the shops don't tell you is you can adjust the Geberit to achieve bigger flush. (See my instructions below) You have to remove the blue clip in the fill valve (right photo, the one with the blue parts, see orange arrow). The fill valve determine the amount of water in the WC; once the blue clip is remove, the valve can be adjust up (increase volume) or down (decrease volume). Once you have adjusted, you need to reinsert/clip back the blue clip to lock the volume. Be careful not to break the clip. After you have done that, the water volume in your WC will increase. As such, you will need to adjust the overflow valve (left photo the one with green parts, orange arrow). Simply move the snorkel of the overflow valve up. No clips or removal required. Anyway, this was shared with me by the service engineer from Genova, who is the official distributor, regardless of which shops you buy Arino Caprio WC. Had him come down to fix a leak, which turned out to be a small grain of sand stuck between the rubber seal and the WC. Oh, if damaged, not my fault