If a toilet in a wrong zone is closed and not used, does it still have an effect?
Yes, 100 percent. Just as a picture changes the mind, a built toilet is itself a figure (aakriti), so even an unused toilet gives its effect.
Related questions
Can these planet items be kept in the toilet?
No, they were not prescribed for the toilet and there is no need to keep them there.
After a puja place built right next to a toilet in a relative house was corrected, I had blood in my stools for 8 to 10 days, and I still feel the same vibe when discussing it. What does such an energy impact indicate?
It indicates negative energy at that place. Dowsers and highly sensitive persons feel such energy much more strongly, and your body was able to sense it; talking about it connects you to it again. The teacher has had similar reactions at sites, once with his whole body going limp, red and sweating and with severe loose motions.
Apart from gridding the house, should the kitchen be gridded separately?
Yes. Interior vastu means zoning each room separately with its own grid and then designing its interior accordingly.
Are the quartz trees sold today good to keep?
Yes. They mostly carry natural quartz of different colours, and they are far better than plastic decor, so they can be kept as showpieces in the interior.
Are the water supply lines coming into the house counted as water bodies?
No. Water lines reach every zone anyway through washrooms and taps, and lines inside the ground do not have much effect. Only dirty water lines matter, which is why they should run clockwise.
As an interior designer, clients choose their own colours and I cannot check their planets; should I give a remedy or try to convince them?
Do not try to convince anyone. People mostly like the colours that match their own planets. If a client chooses an anti-element colour and their kundli allows it, never stop them; it will bring them benefit.