10
SYSTEM PERFORMANCE
Rev C
Pressure Drop Through Post Filter
The Merlin post filter is custom designed to reduce the amount of pressure
drop as much as possible. The Merlin post filter is designed to provide no
more than a 3 psi (0.21 bar) drop when brand new. Using other post filter/
post treatment methods may cause significantly higher drops in pressure.
Figure 7
The Merlin post filter uses Granular Activation Carbon (GAC). Like all other
RO systems, the post filter is critical for providing the best tasting
permeate water.
Pressure Drop Through Faucet
To estimate pressure drop through the Merlin faucet follow the steps
below:
1. Estimate flow rate into the faucet using Table 1.
Use inlet pressure into the Merlin minus the total pressure drop
caused by tubing, elevation, post filter, and obstructions as the Net
Driving Pressure for the purposes of this estimation.
2. Using the estimated flow rate found in step 1 above, find the pressure
drop through the tubing with Figure 8.
EXAMPLE:
Q:
A Merlin will be installed with 8 feet (2.4 m) elevation difference
between the Merlin and the faucet. Find the elevation pressure
drop.
A:
The elevation pressure drop is found as follows:
8 feet X 0.43 psi/foot = 3.5 psi elevation pressure drop
2.4 m X 0.1 bar/m = .24 bar elevation pressure drop
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EXAMPLE:
Q:
A Merlin will be installed with one post filter. Find the post filter
pressure drop.
A:
The post filter pressure drop is found as follows:
1 post filter X 3 psi = 3 psi post filter pressure drop
1 post filter X 0.21 bar = 2.1 bar elevation pressure drop
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