At a small water treatment plant which has 4 filters, the rates of filtration and backwashing are $200 \mathrm{~m}^{3} / \mathrm{d} / \mathrm{m}^{2}$ and $1000 \mathrm{~m}^{3} / \mathrm{d} / \mathrm{m}^{2}$, respectively. Backwashing is done for $15 \mathrm{~min}$ per day. The maturation, which occurs initially as the filter is put back into service after cleaning, takes $30 \mathrm{~min}$. It is proposed to recover the water being wasted during backwashing and maturation. The percentage increase in the filtered water produced (up to two decimal places) would be

At a small water treatment plant which has 4 filters, the rates of filtration and backwashing are $200 \mathrm{~m}^{3} / \mathrm{d} / \mathrm{m}^{2}$ and $1000 \mathrm{~m}^{3} / \mathrm{d} / \mathrm{m}^{2}$, respectively. Backwashing is done for $15 \mathrm{~min}$ per day. The maturation, which occurs initially as the filter is put back into service after cleaning, takes $30 \mathrm{~min}$. It is proposed to recover the water being wasted during backwashing and maturation. The percentage increase in the filtered water produced (up to two decimal places) would be

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