I'm looking at revising my head/holding tank arrangement, and would appreciate any/all advice. Please note that I live in Canada
where pumping overboard
is allowed in open water
on my sailboat pumps into the top of a holding tank
; the holding tank
drain goes to a 'Y' valve, which directs it to either a deck
pump-out, or out of the boat
via the through-hull. The tank is well above the water
line, so when I replaced the hoses etc. I confirmed it could drain well by simply having the Y-valve in the right position and opening the through-hull. However, in practical use - as in our recent summer vacation
- it would not drain, but became plugged as the solids in the tank had collected on the bottom, at least partially blocking the drain. All waste hoses are standard 1.5" and new. I was able to do the unclogging but will not dwell on the details here - just let it be said that I am keen on avoiding this scenario again.
I'm considering one of the following options:
1) Installing an macerating head
- if the waste was macerated before it got into the tank there should be much less chance of blockage; the downside is I'll have to wire in a circuit for it and have more things to drain my batteries
and possibly breakdown. Space is also an issue, as most of the electric
heads I've seen are larger than my current Jabsco
Twist-Lock, and I'm not sure that they'd fit.
2) Installing a manual or electric pump
to drain the tank - pulling the waste out, instead of just relying on gravity, would hopefully allow the tank to be emptied reliably. Downside here is that the pump
would have to be at least 2-3 feet downstream of the tank, and I'm not sure if additional suction would empty the tank, or just make the clog worse by pulling more stuff into the hose. Space is an issue here too, since the only place to mount the pump
would be under the sink and that space is already full of plumbing
Any advice on which of the options would be a better choice? Are there any other alternatives I should be considering? Thanks!