Water coming up other sink after macerator fitted in

[Plumbhandy]

I have a gurgling noise coming up my sink, when the macerator is activated in the other room. Three sinks are linked into the system , anti syphon traps are fitted to all the sinks, 1 macerator is fitted because there was no way of getting the waste away otherwise. It's pumped above ceiling level then falls near the the waste of the sink that's gurgling. Is there another trap on the market that self seals itself, to overcome problem. Thanks will

 

[St0rmer66]

Hep20 trap should do it.

 

[Nige F]

Have a 4lb. lump hammer handy for when the richard111s pop up through the sink waste - HIT `EM

 

[Plumbhandy]

It would be worse than Richard the third, sinks getting used for washing junkie methodone cups. Lol