Correct manufacturing and installation, to ensure a long and succesful life, of the biosand filter requires:
- *that the box that doesn’t leak <br>- *screened and washed sand, (organic free, Uniformity Coefficient of 1.5 – 3.0 and an Effective size of 0.15 – 0.30 mm - a sieve analysis is required to determine these numbers) <br>- *well washed under-drain and separating gravel <br>- *diffuser plate and lid <br>- *safe storage container <br>- *maximum standing water level of 5 cms <br>- *start-up (maturing) time of 14-21 days <br>
====Estimated Lifespan====