If you look in the bottom left corner of the last picture you can see some black electrical tape and a hose going through a hole into the reservoir. This is a small section of garden hose. The connector is outside of the tub. We use this to connect the reservoir to a sump pump and pump the nutrients into the bathtub in the bathroom. Makes it fairly straightforward to change nutrients.
You could probably do something similar with a good pump that's running your sprayers. You could change the connecting piece for the PVC to the pump to a 3 way and have the split-off part go via a separate piece of PVC (and probably several right angle) out the top of the tub in a similar place. Put a PVC valve on the end of it outside the tub. You could then connect a hose to it and open up the valve.
If you do this you would need to be careful to turn the pump off as soon as it ran out of nutrient solution. Letting the pump run dry will destroy it. We just happened to have an extra sump pump lying around. |