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Thanks for all your assistance. RogerH: We actually do back-flush several times before changing the filter. This still only provides us with a short lifespan between change-outs. CH5OH: For this process we are unable (and more possibly unwilling) to pursue something of that large a cost for...

Thank you all for your assistance. Stonecold: We have to cool before the filters for consideration of materials of construction of the 3rd stg filter housing. It will destroy the filter if we run at our normal temp, so we cool to preserve our filters. shahyar: Thanks for that info. This helps...

Ohhh! You typed 90gpm, instead of 9gpm (earlier). Thank you for the clarification though. The pressure drop we see when new filter cartridges are running is around 2.8 - 3.8 psi. That is normal, although we love to see it closer to 2.8 than 3.8. We are evaluating adding to or modifying our...

Thank you Yitbos. Is that estm. gpm/in for water or was it for another fluid? Our process has a fluid at the current concentration is about 96% as viscous as water at the same temp. But at our increased concentration, it's about 30% more viscous than water at that same temp. Thanks again. KPW82

Thanks StoneCold. We have been alternating between 80 and 120 cartridges, but because of the huge expense and large lead time of the cartridges, we want to use as few as possible. With 80, we are having to change them once a week. With 120, we are having to change them every 16 days. We want...

I need help in optimizing the number of filter elements (verticle depth cartridges) used in a filtration process. We have a liquid feed with trace solid contaminant, flowing around 90gpm, continuously through 80 "5 micron" filter elements. The amount of contaminant removed averages 0.03 ppm. The...

I need help in optimizing the number of filter elements (verticle depth cartridges) used in a filtration process. We have a liquid feed with trace solid contaminant, flowing around 90gpm, continuously through 80 "5 micron" filter elements. The amount of contaminant removed averages 0.03 ppm. The...

Thank you all for your replies. I will certainly investigate all suggestions. I'll give an update when complete! Thanks again. KPW82

I have a chemical sewer that will be seeing Cl gas and weak HCl. What material is best to use? I am looking to replace a chemical sewer's manhole, and I have yet to find a company that can provide what we need. If you need more information, just ask.