poly water tanks

Any of you have poly water tanks rather than SS. If so do they impart
any taste or stimulate any growth in tank. SMC is now using poly as
standard.
Any opinions ?
Also does anyone know of an inline water filtration system that will
work with manual pump instead of electric pump. Seagull which is the
best of the lot won’t work with either the Fynspray or the footpump
.