Any suggestions. Just fitted a bath and when allowing the water to drain from it you can expect it to take 30 mins from full. I had to use a shallow trap which I know slows the flow but never had one take this long to drain. The bath is perfectly level and there is no blockage of any kind as all the pipework is new. I think a P trap would have been better but not easy to fit. Customer said the bath took a long time to empty before but is taking longer now!? Any ideas? Also I used one of SF shallow traps and found it did not seal and easily cross threaded. Anybody else had the same problem?