If we put half the product in the pool and half into the skimmer box, does this affect the winter dosing when the pool is closed and filtration is shut down?
The last dose before closing the pool will be done half into the weir and half into the pool (with the pump running). Whilst the pool is closed down, if the test strip shows a lack of PoolSan i.e. Less than 0.4mg/l of Copper, then any dosing can be done directly into the pool without having to start up the pump etc. The first dose when the pool is reopened must be done half into the weir and half poured round the pool with the pump running as per usual.