CDL hobby working slow

[BAP]

Have you changed your pre filters a couple times threw out this course of washing to make sure flow isn’t being reduced as crap comes out of the membrane?

[Asa Matras]

Not though out the wash. Pressure isn't more the 10 psi different before and after the filter

[VT_K9]

We run a CDL 250 Hobby. The only time we get near 200-225 is at the end of the year when the sap is cloudy and we are running more than 500 gallons of raw sap through it. We run our sap through twice and sometimes recirculate to get close to 8%. I will at times run the concentrate a little richer, but nothing like mentioned here. I normally only do that on the first pass and in an effort to get to 4%. We have had our membranes tests a couple years in a row and let them go with storage solution once. They have always tested above 100%.

We do a regular wash cycle at the end of each day of running...new filter, 50 psi rinse for 10 minutes or 100 gallons of permeate, 40 psi wash with about 11-12ph (starting in the mid 70 degree range and the warming the solution up to get at least 10 minutes in the low 80s then warm it up until 84 when it shuts down), then a final 50 psi rinse for about 150 gallons. This has always worked well for us.

Mike

[Clamer33]

We are the same as VT K9. I have had my CDL 250 for 4 years. This year replaced the membranes. Whole other story. Today I have processed 1000 gallons of sap on the first pass started at 1.7%. Then a 150 gallon rinse and start processing the first pass a second time to about 7...+/- brix. the Conc. flow was at 1. Prem 1.5 We double pass all our sap. Pressure is never over 175 psi. Runs mostly around 100 psi at the start after a rinse and finishes around 175 psi after the 500-1000 gallons have gone thru. WE only do a wash if the pressure get close to 200 psi. (CDL soap 3 large table spoons - PH 12 with test strips, start with warm water 70 degrees and run till machine stops are 84 degrees.) 400 gallon rinse.) Maybe 2 to 3 times thru the season. However we do 50 psi of 150 gallons rinses everyday, or between passes. We have 800 taps on high vacuum so we are always waiting on the RO. I have talked to both my rep and a CDL tech many times over the flow rate. The 250 flow rate is base on a measure when your rinsing. Conc. 4 gpm and Pem 2 gpm for a total of 6 gpm x 60 =240. I can assure you 100% you will never see that number when concentrating. With a fully washed membranes, new or not my machine is around 1.25-1.5 on both flow meters. meaning 150-180 gph. That is what you will see. Anything else upgrade like I am doing.