Just replaced a 12 year old CH pump with a Trident digital unit which, supposedly, has no less than 11 intelligent control modes! The pump seems to have 3 modes; fixed speed, constant pressure & proportional pressure & each mode has 3 speed controls but I've no idea which to select for optimum operation & the "Chinglish" instruction manual doesn't really give any guidance on making a choice. I'm a bit out of date with this technology, having previously only ever fitted pumps that have a simple speed selector switch on the front so am somewhat confused as to which mode/speed to select, can anyone help or direct me to an article that explains how to make the best/correct mode?