The readings that came in from july last year (prior to drainbo) are as follows: bod – , mg/l ss – mg/l i just got the readings from last week and they are as follows: bod – , mg/l ss – mg/l ph- . clearly the drainbo has made a huge difference in our effluent! Somersets extra sensitive shaving oil. What is the eco-mode setting on a boiler? is it cheaper than the normal function? Thanks to our many years of.