A plate-and-frame filter press contains 16 frames and operates at a constant flow rate of $30 \mathrm{gpm}$. Each frame has an active filtering area of $4 \mathrm{ft}^{2}$, and it takes $15 \mathrm{~min}$ to disassemble, clean, and reassemble the press. The press must be shut down for disassembly when the pressure difference builds up to $10 \mathrm{psi}$. What is the total net filtration rate in gpm for a slurry having properties determined by the following lab test. A sample of the slurry is pumped at a constant pressure differential of $5 \mathrm{psi}$ through $0.25 \mathrm{ft}^{2}$ of the filter medium. After $3 \mathrm{~min}, 1 \mathrm{gal}$ of the filtrate had been collected. The resistance of the filter medium may be neglected.