These TFC Membranes are of universal size and will replace the existing membrane on any other standard RO system.
Top Quality CSM Membranes are used in all Neptune RO/DI systems.
CSM membranes have an average filtering removal of 99.7% of tap water. They may also be run on well water with just as effective results.
There are three sizes to choose from : 50, 80, & 100 GPD membranes.
*** FLUSH FOR 15 MINUTES PRIOR TO USE.
1) I replaced my membrane and the TDS still does not read zero?
a) Make sure after installing a new membrane that it is properly flushed. New membranes have a thin composite film for preservation purposes. This film eventually gets washed away, but may show up in the final TDS readings of your product water. Flush the system thoroughly for 45min. (remember to disconnect the line going into the DI resin media --if applicable-- so that it does not get wasted during flushing).
b) This will usually occur in older systems that have been exposed to harsh weather conditions over time. Check to make sure the inside part of your membrane housing is not swollen or cracked, where the shaft of the membrane fits into the groove. Anything but a tight fit can result in unfiltered water passing through the membrane and entering as product water. Also, check the fittings on the standard canisters to make sure the cartridges are making a snug fit with the canister. Heat exposure can swell canisters over time causing the cartridges to not fit snug and allow unfiltered water to pass to the membrane.
2) How often should I replace the membrane?
a) With proper maintenance and moderate usage, membranes should last 1.5-2 years. Depending on the chemical chlorination severity of the incoming water quality, this estimate may increase or decrease. If the cartridges filtering the incoming water prior to entering the membrane are not properly maintained, membranes will deteriorate quicker. If chlorinated water enters the membrane directly, it will burn up the core and produce water with increasingly high TDS readings.
3) I get a lot of waste water and hardly no ro water is produced by my membrane.
Is it defective?
a) NO. Most likely the problem lies in the water pressure of your inline source. In order to produce the amount of water that your membrane is rated for, a certain water pressure is required to force that water through the shaft of the membrane. If your water pressure is under 40psi, there will be much less water being forced through the membrane, and much more passing through as waste water. If this is the case, you will need to purchase a booster pump kit.
b) The flush valve located on the waste water (black) line might be in the ( ON or OPEN ) position. If the valve is turned such that it is parallel to (aligned with) the body of the flush valve, then it is considered ON or OPEN. At this position, almost all the water going into the system will come out of the waste water ( black ) line while hardly anything will get produce on the ro/di ( blue ) line.
The flush valve should be positioned perpendicular to the body of the valve during normal operation. This will produce the desired water according to the gpd (gallon per day) specs of the membrane.
