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Thanks for your comments The filter consists of a concrete manhole base and riser (shell), pvc underdrains covered with 0.2m pea metal followed by 44/20 graded sand,(described as sub angular quartz crystals) uniformity coeff 1.53, Calcium oxide 6.3% Magnesium oxide 0.42% calcium carbonate...

Dont have nitrate conc at this stage. Assuming TOC is of algae and vegetable origin from stream. It is seemingly a low value anyway? Arent highland streams usually 5 to 15 mgC/Litre.

Inlet pH 7.7 Alkalinity 18 DO 9 Temp 16 TOC 1.6 Turbidty 1.5 Diatoms & Crytophyta Present - Cryptomonas sp. Abundant Outlet pH 9.1 Alkalinity 33 DO 7 Temperature 18 TOC...

Hi, I am currently running a slow sand filter pilot plant and am gaining some interesting results. The raw water is from a highland stream that is subject to intense freshes. We have placed a pretreatment stage in front of the slow sand that keeps the NTU generally below 5. The filter is not...