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! Contact us today for a free, no obligation quote. Questions? comments? suggestions? issues? Installation and service guides for contractors (pro login required). We've got loyal clients with great things to say about us! Your recommended.